Question

Which value c makes the expression x^2 + 2x + c a perfect square trinomial?

A)  1

B)  2

C)  –4

D)  –2

Answer 1

Explanation:

x²+2x+c=x²+2x+(2/2)²-(2/2)²+c

=x²+2x+1-1+c

=(x+1)²+(c-1)

c-1=0

c=1

A