21M.1.SL.TZ2.7

$\left(f\left(-7\right)=\right) 8$ and $\left(f\left(7\right)=\right) 1$           (A1) 

range is $f\left(x\right)\le 1, f\left(x\right)\ge 8$           A1A1 

Note: Award at most A1A1A0 if strict inequalities are used.

[3 marks]

EITHER

sketch of $f$ and $y=0$ or sketch of $f^{-1}$ and $x=0$               (M1)

OR

finding the correct expression of $f^{-1}\left(x\right)=\frac{-2-5x}{x-2}$               (M1)

OR

$f^{-1}\left(0\right)=\frac{-2-5\left(0\right)}{0-2}$              (M1)


OR

$f\left(x\right)=0$              (M1)


THEN

$f^{-1}\left(0\right)=1$           A1

[2 marks]

[N/A]

[N/A]