What is the value of c so that y=x^2+15x+c is a perfect square.
2 answers:
Divide 15 by 2, then square the amount.
(15/2)^2 = 225/4
Answer: The correct option is (D) 
Step-by-step explanation: We are give to find the value of c so that the following expression becomes a perfect square.

We have

So, for the given function (i) to be a perfect square, we must have

Thus, the required value of c is 
Option (D) is correct.
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