need help

[inland perch]

Complete the square

[scarlet leaf]

yeah but I don't get what it means by in that form

[inland perch]

Just complete the square on it

That’s the form you will get

[scarlet leaf]

alright I'll try it

thanks

[inland perch]

Ping me if you still need help

[scarlet leaf]

@inland perch I got stuck

[humble forum]

Do you have to factorise it?

[scarlet leaf]

no

[vagrant epoch]

2(x^2 - 6x - 23/2)

[scarlet leaf]

at least i don't think so

[scarlet leaf]

got that

[scenic shard]

u have to

[scarlet leaf]

oh

[scenic shard]

and then from there u complete the sqaure

thats if the coefficient of x is more than 1

[vagrant epoch]

2[ (x-3)^2 - 9 - 23/2)

[scarlet leaf]

is this correct

[lament scarab]

Expand it and you’ll see

[inland perch]

There’s no point in putting the 23 inside the bracket

[vagrant epoch]

it doesnt matter

[scarlet leaf]

yeah I checked ms

also

in the exam for edexcel

can they ask to solve quadratic by completing the square

[vagrant epoch]

wdym

[scarlet leaf]

like

will there be questions were they ask you to solve quadratic only by completing the square without the formula

[vagrant epoch]

u mean like the one u just did

[scarlet leaf]

no

[vagrant epoch]

they will say

[scarlet leaf]

oh alright

[vagrant epoch]

they will always say in the form a(x+b)^2 + c

or they will say "complete the square"

[lament scarab]

I think unlikely

They usually assess it by making u state the turning point of a quadratic

Or smth

In which you have to complete the square to find the coords

[inland perch]

Yeah

[scarlet leaf]

alright

[inland perch]

But it’s just easier not to

[scarlet leaf]

alright thanks

[inland perch]

There could be, but it’s unlikely that they’d specifically say no formula

[scarlet leaf]

also it's fine if i

state the turning point as a decimal?

[lament scarab]

Ideally you keep exact values in fractions

Or mixed number

[vagrant epoch]

Its just the value inside ur bracket flipped and the value outside the bracket which stays the same

[lament scarab]

And its easier that way

But decimals will be fine if its accurate

[vagrant epoch]

so (x + 1)^2 -4 the turning point would be (-1,-4)

[lament scarab]

But again I strongly recommend keeping stuff in fractions, makes ur life way easier