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CUET
General Test
Quantitative Reasoning
Algebra
If x4 + x2y2 + y4 = 731,
x2 + xy + y2 = 43, then
find x2 - xy + y2 .
17
19
16
15
Formula → x4 + y4 + x2y2 = (x2 + y2 + xy) × (x2 + y2 - xy)
⇒ 731 = 43 × (x2 + y2 - xy)
⇒ x2 + y2 - xy = \(\frac{731}{43}\) = 17