Question

The value of a for which (x2 + 4x + 2) is a perfect square, is
(a) 16
(b) 9
(c) 1
(d) 4​

Answer 1

Answer:

A perfect square is a quadratic expression that factors into two identical binomials. Therefore, the quadratic expression x2 + 4x + 4 is a perfect square since it factors into two identical binomials which are (x+ 2) and (x+ 2).