Determine the value of x2 + y2 when x3 - y3 = 54, x - y = 18 and xy = 21). 02). 13). 24). 3
Given, x3 - y3 = 54, x - y = 18 & xy = 2
As we know, x3 - y3 = (x - y) (x2 + y2 + xy)
⇒ 54 = 18 × (x2 + y2 + 2)
⇒ 3 = x2 + y2 + 2
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