Question

Let f(x)=4x+3 and g(x)=-2x+5. find (f o g)(5).

Answer 1

$\bf f(x)=4x+3\qquad \qquad g(x)=-2x+5 \\\\\\ (f\circ g)(x)\implies f[\ g(x)\ ] \\\\\\ (f\circ g)(5)\implies f[\ g(5)\ ] \\\\\\ g(5)=-2(5)+5\implies g(5)=-5 \\\\\\ f(-5)=4(-5)+3\implies f(-5)=-17\impliedby (f\circ g)(5)$

Answer 2

Are you allowed to use any form of software, and let it's calculations be your reasons? Because I did it with software and got -17.