9t²+42t+49=(3t+7)²=(3t+7)(3t+7)
9t²+42t+49= (3t)²+3t•2•7+7²=(3t+7)²=(3t+7)(3t+7)
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9t²+42t+49=(3t+7)²=(3t+7)(3t+7)
9t²+42t+49= (3t)²+3t•2•7+7²=(3t+7)²=(3t+7)(3t+7)