-3x-3 is the correct answer
Pulling out like terms :
<span> 1.1 </span> Pull out like factors :
10 - 2y - 20x = -2 • (y + 10x - 5)
<span>Equation at the end of step 1 :</span><span>Step 2 :</span>Equations which are never true :
<span> 2.1 </span> Solve : -2 = 0
<span>This equation has no solution.
</span>A a non-zero constant never equals
(fg)(x)=f(g(x))
So all you have to do is plug the g(x) in
3(3x^2)+9=f(x)
9x^2+9=f(x)
