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Anonymous
It is: 4x -34x^2 -21 simplified
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X2 + 4xx(x + 4)=======
x2(x3 + 1) is the best you can do there.
x2 + 7x + 6 = (x + 6) (x + 1)
x2 + 13x + 36 = (x + 9)(x + 4)
x2 + 5xy - 18y2 can not be factored.