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Anonymous
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x3 + 13x2 + 42x = x(x + 6)(x + 7).
2 x 7 + 5 = 19
If I do your homework for you, you will fail your test.
5x2 + 3x + 8x2 = 13x2 + 3x = x(13x + 3)
572 Because 2x11=22 and 13x2=26 and 22x26=572.