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1. If the question is only to factor this expression:
x^2 + 5x = x(x + 5)
2. If the question is to solve the equation x^2 + 5x = 0:
x^2 + 5x = 0 factor it;
x(x + 5) = 0
x = 0 or
x + 5 =0 subtract 5 to both sides;
x = - 5
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No comment
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5(x2 + x + 1)
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(5x + 2)(x + 3)
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