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SSC CGL 2018 PYQ — Question 92

SSC CGL Tier II Quant - 21/02/2018 • Quantitative Aptitude • Q92

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If x + y = 10 and xy = 4, then what is the value of x4 + y4?

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Correct answer: B

Explanation

The correct answer is option 2 i.e. 8432

x + y = 10, xy = 4

x2 + y2 = (10)2 - 2 × 4 = 92

x4 + y4 = (92)2 - 2 × 42 = 8464 - 32

x4 + y4 = 8432