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Anonymous
21 = 3 x 7 and 7 - 3 = 4 so: (x + 7)(x - 3)
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16x2 - 56x + 49 = (4x - 7)2
x2 - 4x - 21 = (x-7)(x+3)
4x + 20
4x+13 = 21 4x = 21-13 4x = 8 x = 2
This would simplify as 4x-5