4. If a + b = 8 and ab = 6, find the value of a + b3
5. If a - b = 6 and ab = 20, find the value of a - b3
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(a+b)^3 = a^3 + b^3 + 3ab(a+b)
=> 8^3 = a^3 + b^3 + 3(6)(8)
=> 512 = a^3 + b^3 + 144
=> a^3 + b^3 = 368
5) (a-b)^3 = a^3 - b^3 - 3ab(a-b)
=> 6^3 = a^3 - b^3 - 3(20)(6)
=> 216 = a^3 - b^3 - 360
=> a^3 - b^3 = 516
=> 8^3 = a^3 + b^3 + 3(6)(8)
=> 512 = a^3 + b^3 + 144
=> a^3 + b^3 = 368
5) (a-b)^3 = a^3 - b^3 - 3ab(a-b)
=> 6^3 = a^3 - b^3 - 3(20)(6)
=> 216 = a^3 - b^3 - 360
=> a^3 - b^3 = 516
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