p+3 p-3 (p+3)(p-4) - (p-3)(p+4) -------- - ------ = ---------------------------- =p+4 p-4 P^2 - 16p^2 -4p +3p -12 -p^2-4p+3p+12 ) -2p------------------------------------------- = ---------- p^2-16 p^2 -167p+g p+7g 7p+g p+7g 7pg+g^2 -p^2-7gp---------- + ------------- = ---------- - ------------- = ------------------------- =p(p-g) g(g-p) p(p-g) g(p-g) pg(p-g)g^2 -p^2 (p-g)(p+g) p +g----------- = - ------------------ = - -----------gp(p-g) gp (p-g) pg