My homework is due within the hour online, and I can't seem to figure out this problem..
It says Evaluate F(3x+5)if f(x)=2x^2+2x+3
Now in the solutions manual it gives the follwing steps
f(3x+5)=2(3x+5)^2+2(3x+5)+3
= 2(9x^2+30x+25)+6x+10+3
=18x^2+66X+63
I get the whole problem except for- how did they get the 30x in the 2nd step? Can someone please tell me how they got the 30x? Thanks!