Explain how to find the value of z if you know that 100x*2 + 120x + z is a perfect square trinomial

asked Dec 20, 2018 206k views

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5 votes

Recall that (a+b)²=a²+2ab+b²

100x²+120x+z
in this case, because100x²=(10x)², a=10x, z=b²
120=2*10*b
b=6
z=b²=36
the square is (10x+6)²

JustLearn answered Dec 25, 2018

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