Question

If x + y = 9 and xy = 16, find the value of x2 + y2.
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Answer 1

Answer:

Explanation:

x+y=9

y=9-x

xy=16

x(9-x)=16

9x-x^2=16

x^2-9x+16=0

solve the quadratic equation find x then y

Answer 2

Explanation:

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