Question

If x+ y = 9 and xy = 5 find the value of x2 + y2.​

Answer 1

Answer:

71

Step-by-step explanation:

${(x + y)}^{2} = {x}^{2} + {y}^{2} + 2xy$

${(9)}^{2} = {x}^{2} + {y}^{2} + 2 \times 5$

${x}^{2} + {y}^{2} = 81 - 10$

${x}^{2} + {y}^{2} = 71$

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Answer 2

Answer:

71

Step-by-step explanation:

xy2 = x + y - 2 x 5

(9)2 = 9 x 9 - 2 x 5

81 - 10 = 71

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