Question

simplify:(3x-4y)^3-(3x+4y)^3​

Answer 1

Step-by-step explanation:

We know : (a + b)3 = a3 + b3 + 3a2b +3ab2 And (a - b)3 = a3 - b3 - 3a2b +3ab2

So,

⇒( 27x3 + 64y3 + 108x2y + 144xy2 ) - ( 27x3 - 64y3 - 108x2y + 144xy2 ) - 216x2y

⇒ 27x3 + 64y3 + 108x2y + 144xy2 - 27x3 + 64y3 + 108x2y - 144xy2 - 216x2y

⇒128 y3 + 216 x2y - 216 x2y

⇒128 y3 ( Ans )

Answer 2

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