Please help me solve these two problems. My addition sign is not working on my keyboard.

Question

a^4b plus a^2b^3

18z plus 45plus z^2

Answer 1

I assume you want to factor the expressions?

a^4b + a^2b^3 = a^2b(a^2+b^2)

z^2 + 18z + 45 = (z+3)(z+15)

Answer 2

Thank you Steve and can you please explain how you got both answers, so that I can get a better understanding. Thanks