Question 142147
1.{{{3x(-x+5)=3x(-x)+3x(5)=-3x^2+15x}}}
2.{{{3x^3(x^3+5)=3x^3(x^3)+3x^3(5)=3x^6+15x^3}}}
3.{{{(-2x+1)(x+5)=-2x(x)+(-2x)(5)+1(x)+1(5)=-2x^2-10x+x+5=-2x^2-9x+5}}}
4.{{{y^2+8y=y(y+8)}}}

I have broken down the steps so you can see everything I did. If you have difficulty further, or would like me to explain something in detail, send me an E-mail at enabla@gmail.com   .