Posted by PLZ HELP ME NOW... on Wednesday, May 30, 2012 at 6:03am.
=15x(x-3) - 6(x-3)
Notice that by changing the sign of odd powers, the coefficients add up to zero:
So x+1 is a factor.
Divide by x+1 gives
which factorizes readily to
So the whole factorization is:
=(1/2)[2x^2+x - 3(2x+1)]
(d) will be left as a practice for you.
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