(a)[3]
Combine as a single fraction in simplest form $\dfrac{3}{y-1} - \dfrac{5}{y+6}$.
(b)[3]
Simplify the expression $\dfrac{2y^2 - 5y - 12}{y^2 - 16}$.
(c)[4]
Solve $3(x^2 + 3) = 11x$. Show your working and give your answers accurate to $3$ significant figures.