Question

Find all the values of c that make x^2+cx+64 a perfect square.

Answer 1

so if we check for the form a^2 + 2ab + b^2,

a^ = x^2
b^2 = 64, so b= +8, or -8

so, cx = 2.8.x or 2.(-8).x
so, c = 16 or -16

Answer 2

16 will be right sure

Answer 3

-16 as well

Answer 4

yes -/+ 16 are right too