document.write( "Question 948909: Which of the following quadratic equations has a perfect square trinomial on the left side of the equals sign?\r
\n" ); document.write( "\n" ); document.write( "A. x^2+2x+4=0
\n" ); document.write( "B. x^2+6x-9=5
\n" ); document.write( "C. x^2+6x+9=3
\n" ); document.write( "D. x^2+4x=4
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Algebra.Com's Answer #579244 by josgarithmetic(39617)\"\" \"About 
You can put this solution on YOUR website!
\"...on the left side...\"\r
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\n" ); document.write( "\n" ); document.write( "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.\r
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\n" ); document.write( "\n" ); document.write( "You might wonder about B.
\n" ); document.write( "It is not.
\n" ); document.write( "Try factoring it.
\n" ); document.write( "(x______-3)(x______-3), will not work because the x term is -6x.
\n" ); document.write( "(x_____3)(x______3), will not work because the constant term is +9.
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