Question

What is f(x) = 7x2 + 42x written in vertex form?

f(x) = 7(x + 6)2 – 6
f(x) = 7(x + 6)2 – 42
f(x) = 7(x + 3)2 – 9
f(x) = 7(x + 3)2 – 63

Answer 1

Well for starters cross out C) and D) and tell me what do you think it is

Answer 2

A

Answer 3

If that's what u think it is, than go for it

Answer 4

f(x) = 7x2 + 42x

factor out the 7 to get f(x) = 7(x^2+6x)

divide the b term by 2 and square the result to get 9 (this will create a perfect square)

add 9 to the inside of the brackets

7(x^2+6x+9)

subtract 7*9 from the outside to keep the equation equal

7(x^2+6x+9) - 63

then finish up the factorization

Answer 5

x = -6
x = 0
Reformatting the input :

Changes made to your input should not affect the solution:

(1): "x2" was replaced by "x^2".

Rearrange:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

0-(7*x^2+42*x)=0