Hi, i'm just revising some AS maths and I have (stupidly) forgot how to answer this question...
Curve has equation f(x)=8/x+1/2x-5
(i) find roots of equation 2f(x) =0
for this I doubled the 8/x+1/2x-5 to get 16/x+x+10 and made equal 0. I got the answer x=8 or x=2. is this right???
(ii) find roots of equation f(4x)=0.
i'm not sure how to approach this question. what do I need to do??