Using factorials, expand (2a-b^4)3?

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Using factorials, expand (2a-b^4)3?

2007-04-22 19:04:48 · 2 answers · asked by sparklycrayons 1 in Science & Mathematics ➔ Mathematics

2 answers

The expansion of (x-y)^3 is x^3 - 3x^2 y+ 3x y^2 - y^3. So let x= 2a and y= b^4, and substitute.

2007-04-22 19:12:10 · answer #1 · answered by cattbarf 7 · 0⤊ 0⤋

For (x + y)³ the upward thrust is x³ + 3x²y + 3xy² + y³. permit x = 2a, and y = -3b. Then we get this: (2a - 3b)³ = (2a)³ + 3 (2a)²(-3b) + 3 (2a)(-3b)² + (-3b)³ = 8a³ - 36a²b + 54ab² - 27b³. So the respond is (2a-3b)³ = 8a³ - 36a²b + 54ab² - 27b³.

2016-12-16 13:08:18 · answer #2 · answered by ? 4 · 0⤊ 0⤋