Posted by Michelle on Wednesday, December 21, 2011 at 11:11am.
A little synthetic division shows
5x^5 + 32x^4 - 5x - 32
= (x-1)(x+1)(5x^3 + 32x^2 + 5x + 32)
Notice the 5,32 5,32 coefficients.
a little regrouping gives
(x-1)(x-1)(x^2(5x+32) + (5x+32))
(x-1)(x+1)(x^2 + 1)(5x+32)
Actually, we could have saved ourselves the synthetic division by noticing the 5,32,5,32 grouping at first:
(x^4 - 1)(5x+32)
You can probably take it from here . . .
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