The given expression has 5x(x2+1)4(x3+1)4 as a common factor, so
10x(x2+1)4(x3+1)5 + 15x2(x2+1)5(x3+1)4
=
5x(x2+1)4(x3+1)4 [2(x3+1) + 3x (x2+1)]
=
5x(x2+1)4(x3+1)4 [2x3+2 + 3x3+3x)]
=
5x(x2+1)4(x3+1)4 [5x3+ 3x + 2)]
Enter this as 5x*(x^2 + 1)^4*(x^3 + 1)^4 *(5*x^3 + 3*x + 2)
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