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