Question 367621
9(2x+1)^3+6(2x+1)^2-15(2x+1)
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(2x+1)(9(2x+1)^2+6(2x+1)-15)
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(2x+1)(9(2x+1)^2+9(2x+1)-3(2x+1)-15))
let (2x+1)=a
a(9a^2+6a-15)
3a(3a^2+2a-5)
3a(3a^2+5a-3a-5)
3a((a(3a+5)-1(3a+5))
3a(3a+5)(a-1)
resubstitute the value of a
3a(3(2x+1)+5)(2x+1-1)
3(2x+1)(6x+3+5)(2x)
6x(2x+1)(6x+8)
12x(2x+1)(3x+4)
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