(2x+1)(x-3)=(x-1)² check whether the following is a quadratic equation
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(2x+1)(x-3) = (x-1)²
2x²-6x+x-3 = x²-2x+1
2x²-x²-6x+2x+x-3+1 = 0
x²-3x-2 = 0
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