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Subtract 21 from both sides.

If that's + 4t, the answer is (t - 3)(t + 7) and t = 3, -7

If that's - 4t, the answer is (t + 3)(t - 7) and t = -3, 7

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Q: How do you solve the quadratic equation t2 4t equals 21 by factoring?
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