Question

Find the value of a^3-27b^3 if a-3b =-6, ab = -10

Answer 1

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Answer 2

Answer:

a3 - 27b3=?

a-3b=-6

ab=-10

using (a-b)3=a3-b3-3ab(a-b)

         (a-3b)=(a)3-(3b)3-3ab(a-3b)

         (-6)3 =(a)3 - (3b)3 - 3(-10)(-6)    

         a3-27b3 = -216+180

                  ANSWER =a3-27b3 = -36

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