Need help completing the square

[safe pendant]

my last question

[mint flame]

well so

what happens when u square a binomio?

$(a+b)^2 = a^2 + b^2 + 2ab$

[fluid jetty]

αβγ

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$x^2 + 8x - 6$

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αβγ

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and u want it in the form of

$(x+a)^2+b$

[fluid jetty]

αβγ

[mint flame]

so the x^2 is already there, but where does the 8x come from?

well, it comes from 2ab, only

so what is a? a=1, cuz x^2 is multiplied by 1

so a = 8/2

$(x+4)^2 = x^2 + 8x + 16$

[fluid jetty]

αβγ

[mint flame]

Well, we got the first part, x^2 + 8x

we just added an extra 16

we need to substract it

and then we had a -6

$(x+4)^2 - 22 = x^2 + 8x - 6$

[fluid jetty]

αβγ

[safe pendant]

yeah

so what are the answers

because i did the same thing and it was wronf

[mint flame]

now u solve the equation (?)

$(x+4)^2 - 22 = 0$

[fluid jetty]

αβγ

[safe pendant]

yeah

its 4+ root 22 and 4 - root 22

[mint flame]

$(x+4)^2 = 22 -> x+4 = +- \sqrt{22}$

[fluid jetty]

αβγ

[safe pendant]

lemme show you the multiple choice answers

[mint flame]

im not telling u the answer man

[small flame]

@safe pendant in which grade ur in?

[mint flame]

x+4 = +- sqrt(22)

[safe pendant]

year 9

[safe pendant]

thats not what im meant to do

[small flame]

From

[mint flame]

yes it is

if u dont know what are u being asked, well, gg

[safe pendant]

not in the video

is it not just 4- root 22 and 4 + root 22

[mint flame]

u have x+4 = +- sqrt(22)

cant u solve this?

[safe pendant]

yeah

rt 22 and - rt 32

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so what is the answer

[safe pendant]

22

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x= what

[safe pendant]

x = 4 + rt 22

[mint flame]

?

no

[safe pendant]

x= 4 - rt 22

what do u mean no

thats what it tells me to do

[mint flame]

that is not the answer

$x+4 = \sqrt{22}$

[fluid jetty]

αβγ

[mint flame]

issolate x

[safe pendant]

oh wait

-4 + square root 22

-4 - root 22

isnt it just that

[mint flame]

idk, u tell me

[safe pendant]

ima try it

it was right

while ur here can u help me w another one?

[mint flame]

just ask

[mint flame]

u can do this on ur own

[safe pendant]

i tried

it was wrong

[mint flame]

then pay more attention to the operations u make

what is the quadratic formula?

[safe pendant]

• b +- root b^2 - 4ac / 2a

that dot is supposed to be a -

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then what are a b and c?

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a = 6 b = 5 c = -21

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then i dont see the problem

[safe pendant]

u have to simplify the fraction

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u just replace numbers

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what does that mean?

[safe pendant]

wait i got

done

+close