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Anonymous
2x² multiplied by 5 = 10x²
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It equals 53X- a number is squared when it is multiplied by itself, so 7X by 7X = 49X. 2X by 2X =4X, so 49X + 4X is 53X.
2x2 + 5x = x*(2x + 5)
2x2 + 7x - 15 = (2x - 3)(x + 5)
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