Question

how do i find the vertex of x^2-8x+7

Answer 1

In this form, the easiest way to find the vertex is to use the formula x=-b/2a. This will give you the x coordinate.

Answer 2

The a and b come from ax^2+bx+c

Answer 3

So, a=1, b=-8, c=7

Answer 4

So, the x-coordinate is -8/2 or -4.

Answer 5

Then, plug -4 in for x in the function to find the y-coordinate.

Answer 6

Make sense?

Answer 7

i think so. thanks again :)

Answer 8

No worries :)

Answer 9

Can you tell me what you get for y?

Answer 10

-9

Answer 11

(-4)^2 is 16
-8(-4) is 32
+7
16+32+7=?

Answer 12

yep you're right i had to look
at it again

Answer 13

No worries, happy studies :)

Answer 14

haha thanks