#weird solving? HELP

98 messages · Page 1 of 1 (latest)

eternal python
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can someone show how they've subbed in 4 and 2 and have managed to manipulate everything in root twos,

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2022 P2 ^

acoustic storm
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which question is this

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@eternal python

eternal python
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8

acoustic storm
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2022 paper 2

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ok

eternal python
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yh

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4 and 2 are the limits i just cant see how they've manipulated it

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i only lost 1 mark anyway but still

acoustic storm
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this one

acoustic storm
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multiply 0 by 4rootx

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(x-2)(x-4)=0

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x=4

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x=2

misty wedge
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Then they expanded evrything and divided by 4 sqrt(x)

acoustic storm
eternal python
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bro i know what to do

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i just cant manipulate it at the end

compact light
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What can’t you manipulate

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The root 2s are just there as a result of substituting 2 into the terms

eternal python
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its bc of my calcultor

acoustic storm
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Times 0 by 4rootx

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(x-2)(x-4)

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X=2 x=4

eternal python
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omds thats nto what i mean. at the end after you integrate and find the integral, you need plug in 4 and 2

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and get the answer in root2 s

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i cant do it bc when i put the values in my cal it doesnt simply to a surd, it shows it as a decimal

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its fine forget it

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its one mark

acoustic storm
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sorry for missreading

halcyon belfry
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and you can simplify using that

compact light
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Ur either writing something wrong or just have the worst A level calculator if it can’t even represent things in surd form

halcyon belfry
compact light
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“Write your answer in exact form” writes 0.1941125497…

halcyon belfry
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lol

compact light
halcyon belfry
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wait can it show that

compact light
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Mine sure can if that’s what you mean

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halcyon belfry
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oh yeah but thats the CG50

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wait actualy thats a simple surd

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mine could probably do that too

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they probably typed it in wrong then

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better to do integration calculations where it asks for exact value in your head though

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or part by part in the calculator

compact light
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I just write out the entire equation with x and I can change variables of x in my calculator so it’s quick

halcyon belfry
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i dont think my calculator can do that

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im probably gonna get the one you have when i start further maths next year

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i dont want it but i think we need it for certain parts of the course

eternal python
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clearly mine

compact light
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Well

eternal python
halcyon belfry
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What calculator you got

eternal python
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see the picture abover

halcyon belfry
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Wait I have the same one it just doenst have the solar panel

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I thought mine can do it

eternal python
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just try it and see

halcyon belfry
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Alr one sec

fresh iron
halcyon belfry
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Yeah this is shit

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The one I had before could do it

fresh iron
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Buy a cg50

halcyon belfry
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How did my one at gcse do it but this cant

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My shit downgraded

halcyon belfry
fresh iron
eternal python
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does anyone acc know how to do it algebraically?

halcyon belfry
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It can represent the form as well so idk what's wrong

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halcyon belfry
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Take something to the power of 1/2 as root

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You can take the numerator as normal power

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And simply using that

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E.g. 2^(3/2)

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Is root (2^3)

fresh iron
halcyon belfry
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Which is root 8 which is 2 root 2

wanton plinthBOT
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Pringle

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halcyon belfry
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Wow that's cool

fresh iron
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Dyu get it

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Oh you weren’t the one asking the q nvm

eternal python
fresh iron
wanton plinthBOT
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Pringle

1128444605604573214.png
fresh iron
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$$(\sqrt{2})^5 = \sqrt{2} * \sqrt{2} * \sqrt{2} * \sqrt{2} * \sqrt{2}$$

wanton plinthBOT
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Pringle

1128444605604573214.png
eternal python
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its alright

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thanks for this

compact light
eternal python
misty wedge
# eternal python

its because u put ur powers as fracion put it in root format u will get it

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damn it actually doesnt