(x - 7)(x - 3)
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If that was - 10x + 21, it would factor to (x - 3)(x - 7) If that was + 10x + 21, it would factor to (x + 3)(x + 7) As it is, the solutions are irrational.
If that's + 10x + 21, the answer is (x + 7)(x + 3)
3
(t + 7)(2t - 3)
21 is the largest factor of 21