Question

write y=(x-4)(x+2) in standard form

Answer 1

please help me

Answer 2

y = x^2 + 2x -4x - 8
x^2 + 2x - 8
would you like to do it from there to change it into standard form?

Answer 3

its a trick question?

Answer 4

idk is that the standard form?

Answer 5

yes!!! ok I thought you didn't know what the standard form of a quadratic equation will be so was asking a trick question.

Answer 6

lol okay i get ya now :)

Answer 7

ok

Answer 8

it says to use the standard form to change to vertex form and show your work

Answer 9

well the vertex form is y = a(x - h)^2 + k
and the standard form was y = ax^2 +bx + c
so you already found the x and a which is like in this equation
a = 1 b = 2 c = -8
so if you want the vertex you need to know this equation
-b / 2a

Answer 10

if you do that you will find the k
and then when you plug in the k into the standard form equation you will get the h