1) f(x)=5x^2; f(-3)=5(-3)^2=45
2) f(x)=5x^2; f(3a)=5(3a)^2=45a^2
3) f(x)=5x^2; f(x-1)=5(x-1)^2=5(x^2-2x+1)=5x^2-10x+5
1) f(x)=5x^2; f(-3)=5(-3)^2=45
2) f(x)=5x^2; f(3a)=5(3a)^2=45a^2
3) f(x)=5x^2; f(x-1)=5(x-1)^2=5(x^2-2x+1)=5x^2-10x+5