Question

This is quick, can you just check my answer please!


What is y = x2 12x + 20 written in vertex form?
(Points : 4)
y = (x -12)^2 + 36

y = (x - 12)^2 + 26

y = (x- 6)^2 - 16

y = (x- 6)^2 + 20

I think it is C

Answer 1

Oops! the question is y=x^2 -12+20

Answer 2

x2 12x + 20

+/- 12x??

Answer 3

Oh nvm

Answer 4

y=x^2-12+20

Complete the square

y-20=x^2-12

(b/2)^2 for the value of c, which is 36, add to both sides

y+16=x^2-12+36

y+16=(x-6)^2

subtract 16

y=(x-6)^2-16

Answer 5

Vertex form=y=a(x-h)^2+k

Find the vertex by x=(-b/2a)

x=6

Plug it in.

y=6^2-12(6)+20
y=36-72+20
y=-16

Vertex=(6,-16)

y=a(x+6)^2-16

So yeah, C is right.

Answer 6

So yeah, you are right

Answer 7

epic timing @ashley_king

Answer 8

ha i was just thinking that @dtan5457

Answer 9

Haha thanks guys!! <3 :* Xx

Answer 10

We both have different ways of solving it though, good to look at both :)

Answer 11

I don't know who to give the medal toooooo!! D: