Is (H + G)-' = H¯ +G¯\? Explain your answer.

simplify (12a^(-1)b^(3)c^(-1))/(6a^(3)bc^(-2))

For the curve y = -(x³ – 54), find the equation of the tangent to the curve, which passes through the origin. Hence find values of a, for which the equation –(x³ – 54) = ax has i exactly one real solution. ii exactly two real solutions. iii exactly three real solutions.

it said to usex < -1,2<x<4;x<-2 or x > 4