Answer:-27a³b⁶+ 8a⁹b¹²Step-by-step explanation:In the expression above -27 is a perfect cube of -3, 8 is a perfect cube of 2.The exponents of a and b in both terms in the expression are divisible by 3.The cube root of x, that is ∛xⁿ=x∧(n/3) where n is an integer.