Question 948909: Which of the following quadratic equations has a perfect square trinomial on the left side of the equals sign?
A. x^2+2x+4=0
B. x^2+6x-9=5
C. x^2+6x+9=3
D. x^2+4x=4
Answer by josgarithmetic(39617)   (Show Source):
You can put this solution on YOUR website! "...on the left side..."
Some of us can recognize the square trinomials with experience and simple understanding. NOT A nor D, since those just appear to not be square trinomials on the left. C is a square trinomial on the left.
You might wonder about B.
It is not.
Try factoring it.
(x______-3)(x______-3), will not work because the x term is -6x.
(x_____3)(x______3), will not work because the constant term is +9.
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