Asked by Wayne deno

If 25x²+k+9 is a perfect square find k
Answered by Steve
well, 25=5^2 and 9=3^2, so try

(5x+3)^2 = ?

Note that you will get two answers.
Answered by micky
(b/2)^ 2=ac
so k^2/2=25X9
=225
225X4=900
k^2=900
so k=30
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