plz give a reason for the answer
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Step-by-step explanation:
x² + 5x + 6 = (x+3)(x-5)
=> x²+5x+6 = x²-2x-15
=> 5x + 6 + 2x + 15 = 0 [ x² cancels out ]
=> 7x + 21 = 0 is not a quadratic equation but is a linear equation
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