Mathematics 9709 · AS & A Level · Functions

Functions — practice question

The function $f$ is given by $f(x) = 2x^2 + 3$ for $x \geq 0$.

(a)[2]

Find a simplified expression for $ff(x)$.

(b)[4]

Solve the equation $ff(x) = 34x^2 + 19$.

Worked solution & mark scheme

This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Correct substitution form $f(x)=2(2x^2+3)^2+3$” …