1.

If x + y = 10 and x2 + y2 = 68, then find xy1. 182. 243. 174. 16

Answer» Correct Answer - Option 4 : 16

Given:

x + y = 10

x2 + y2 = 68

Formula Used:

(a + b)2 = a2 + b2 + 2ab

Calculation:

(x + y)2 = x2 + y2 + 2xy

⇒ (10)2 = 68 + 2xy

⇒ 100 - 68 = 2xy

⇒ xy = 32/2 = 16

∴ The value of xy is 16.



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