Question

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

Answer 1

Answer-d)4

Explanation-

Since f(x) is perfect square, then both the roots are equal.

∴ D=0

16−4a=0

a=4