x2 + 4x - 21 = (x + 7)(x - 3).
The trick is to find 2 numbers which sum to 4 and have a product of -21.
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The factors of x2 are x and x x times x plus 1 = x2 + x
x2 + 3x + 2 factors into (x + 1) (x + 2)
51.07142857142857
(X + 5)(X + 1) FOIL this. X2 + 1X + 5X + 5 Gather terms. X2 + 6X + 5 ----------------------------those were the factors
x3 - x2 + x - 2 has no rational factors.