
Differentiate both sides wrt
:

By the chain rule, we get


Solve for
:


71/100 because 71 cant be divided by anything
You need to factor the numerator and denominator...
(2x^2+4x-2x-4)/(2x^2-2x-2x+2)
(2x(x+2)-2(x+2))/(2x(x-1)-2(x-1))
((2x-2)(x+2))/((2x-2)(x-1)) so the (2x-2)s cancel out leaving
(x+2)/(x-1)
<span>3 3/4q=30 </span>Answer: q=8