• anonymous
Solving a quadratic - like equation... I am totally confused! Here is the problem: (x^2 + 4x)^2 - (x^2 + 4x) - 20=0. It says let A = X^2 + 4x, then A^2 - A - 20 =0. Then they factored it (A-5)(A+4) = 0 I understand how they factor it, but I do not understand how they got from step one to step two. Someone help me? Where did the A^2 - A - 20 = 0 come from?
Mathematics
• Stacey Warren - Expert brainly.com
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SOLVED
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