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Question
If a-b=2 and a*b=15 find a3-b3
If a-b=2 and a*b=15 find a3-b3
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Solution
Given that a - b = 2,ab = 15
We know that (a-b)^3 = a^3 - b^3 -3ab(a-b)
(2)^3 = a^3 - b^3 - 3(15)(2)
8 = a^3 - b^3 - 90
8 + 90 = a^3 - b^3
98 = a^3 - b^3.
We know that (a-b)^3 = a^3 - b^3 -3ab(a-b)
(2)^3 = a^3 - b^3 - 3(15)(2)
8 = a^3 - b^3 - 90
8 + 90 = a^3 - b^3
98 = a^3 - b^3.
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