Question

If x-y=9 and xy=16 ...find the value of (x2 + y2 ) ​

Answer 1

Step-by-step explanation:

$x {}^{2} + y {}^{2} = (x - y) {}^{2} + 2 \times xy \\ = (9) {}^{2} + 2 \times 16 \\ = 81 + 32 \\ = 113$

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