Question
If a + b = 8 and ab = 5, then what is the value of a³ +
b³?Solution
ATQ;
Given, a + b = 8, and ab = 5
So, a³ + b³ = (a + b)³ - 3ab(a + b) = 8³ - 3 * 5 * 8 = 512 - 120 = 392
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