0
Anonymous
7a2 + 53a + 28 = 7a2 + 49a + 4a + 28 = 7a(a + 7) +4(a + 7) = (a + 7)(7a + 4)
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59
28
basically you asked what -28+21 which equals -7
8,444 + 67 + 217 + 28 + 3,496 + 732 = 12,984
14 + 14 = 28