WebSolution: Given expression: (x-2y) 3. We know that (a-b) 3 = a 3 -3a 2 b+3ab 2 – b 3 In the expression (x-2y) 3, a = x and b = 2y. Now, substitute the value in the a-b whole cube formula, we get (x-2y) 3 = x 3 – 3 (x) 2 (2y) + 3 (x) (2y) 2 – (2y) 3 (x-2y) 3 = x 3 – 6x 2 y+12xy 2 – 8y 3. Hence, (x-2y) 3 = x 3 – 6x 2 y+6xy 2 – 8y 3.. WebWhat is the (a + b)^3 Formula? (a + b) whole cube formula says: (a + b) 3 = a 3 + 3a 2 b + 3ab 2 + b 3. To find the cube of a binomial, we will just multiply (a + b)(a + b)(a + b). (a + b) 3 formula is also an identity. It holds true for every value of a and b. Derivation of a plus b whole cube Formula. The (a + b) 3 formula can be derived as.

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