- (a) Given that
$$2 \log ( 4 - x ) = \log ( x + 8 )$$
show that
$$x ^ { 2 } - 9 x + 8 = 0$$
(b) (i) Write down the roots of the equation
$$x ^ { 2 } - 9 x + 8 = 0$$
(ii) State which of the roots in (b)(i) is not a solution of
$$2 \log ( 4 - x ) = \log ( x + 8 )$$
giving a reason for your answer.