what is the standard form of quadractic equation (x+3)(x-3)=x (4x+5)
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(x+3)(x-3)=x (4x+5)
(x^2 -3^2) =4x^2 + 5x
x^2 -9= 4x^2 + 5x
0=4x^2 + 5x -x^2 + 9
0=3x^2 + 5x+9
3x^2 + 5x+9=0
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