Question

what value added to x^2-8x would complete the square?

a. 64
b. 16
c. -16
d. -4

Answer 1

(x + a)^2 = x^2 + 2*a*x + a^2
so in the question, what is the value of a?

Answer 2

I think so

Answer 3

So what is a in this case?

Answer 4

x?

Answer 5

No, x is the variable in the equation. (x+a)^2 in which a is a constant. so what is the value of a?

Answer 6

8

Answer 7

Good so u see the constant there....it is actually -8.
Since 2a=-8, what is the value of a?

Answer 8

1

Answer 9

@superdavesuper

Answer 10

No, a is not equal to 1 in this case

Answer 11

oh ok

Answer 12

So if u know a, then the value to add to complete the square is a^2

Answer 13

16?

Answer 14

BINGO!! :) good job!

Answer 15

thanks