The quotient rule is ( f'(x)g(x)-f(x)g'(x) )/ (g(x))^2 {complex written on 1 line I know}
let f(x)=9x +13 and g(x)=2x+4 <span> f'(x)=9 and g'(x)=2 </span> <span> therefore just substitute the equations in. </span> <span> y'= 6x - ((9(2x+4)-2(9x+13))/((2x+4)^2)) </span>
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