When you write these Shaniab you should use the 'hat' to indicate exponents. :)
1−5(x^3+x^2)=-5x^2−4(x^3+2)
I would like you to try and do it yourself Shaniab
Just remember that the minus sign belongs to the number that follows it.
I have added stuff that might help you a bit.
1+[−5(x^3+x^2)]=-5x^2+[−4(x^3+2)]
Now can you give it a go?