Question

What is the vertex of the function f(x) = 7x2 - 28x - 60?

(2, -88)

(3, 56)

(2, 88)

(3, -56)

confuse...

Answer 1

use
\(\dfrac{-b}{2a}\)

Answer 2

-28 b?

Answer 3

and 7 a?

Answer 4

\(\dfrac{-(-28)}{2*7}\)

Answer 5

\(\dfrac{28}{14}=2\)

Answer 6

28/14=2

Answer 7

the plug 2 into the equation for x

Answer 8

oh u did it before i could lol

Answer 9

2 is x?

Answer 10

\(f(2)=7*2^2 - 28*2 - 60\)

Answer 11

yes x=2

Answer 12

-88?

Answer 13

correct

Answer 14

2,-88

Answer 15

yup

Answer 16

good to see u back on too lol

Answer 17

:)

Answer 18

oh no, i dnt get the next one at all...post here or new post?

Answer 19

new?

Answer 20

wait i might be able to do it, let me post it and show my work before u comment to check it?

Answer 21

ok