F(X)= 4/(x-3) g(x)= (x+2)/x solve fg(a)= 1
4/(x-3)*(x+2)/x= 4x+8/ x2 -3x
sub in a for x4a+8/a2-3athen equate to 1: 4a+8/a2-3a=1Times the bottom half of the equation up4a+8=a2-3aThe move the 4a+8 across to get a2-7a-8=0Factorise (a+1) (a-8)
EJ
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