What is the value of c so that y=x^2+15x+c is a perfect square trinomial?

7 answers

c must be 225/4 or 56.25
take 1/2 of 15, then square it

check:
(x + 15/2)^ = x^2 + 15x + 225/4
thanks i needed this
wow im so late
by 4 years? also corona is still happening
Thank you for the answer being I needed that
Whats the value of x
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