Question

PLEASE HELP ME! WILL MEDAL U!

What number would you have to add to both sides to complete the square?

x^2 – 16x = –8

A. 64
B. –16
C. 16
D. –64

Answer 1

I believe it is -16

Answer 2

ask google

Answer 3

really?

Answer 4

x^2 - 16x = (x -8) ^2 - k [its -8 because we take half of -16)

what do you think the value of k is?

Answer 5

16

Answer 6

HInt: if we expand (x-8)^2 we get x^2 - 16x + 64

Answer 7

so 16?

Answer 8

no not 16

Answer 9

@welshfella can i tag u and can u help me when ur finished here please

Answer 10

ok

Answer 11

x^2 - 16x + 64 + k = x^2 - 16

k = ?

Answer 12

-8

Answer 13

no
you need to get rid of the + 64 so as to make right side = x^2 - 16x
so what do you add to 64 to make 0?

Answer 14

check out my last post

Answer 15

-64

Answer 16

yes!

thats your answer -64

Answer 17

x^2 - 16x + 64 - 64 = x^2 - 16

Answer 18

x^2 - 16x = -8
(x -8)^2 - 64 = -8 -64
(x - 8^2 = -8 - 64 + 64
(x -)8^2 = -8