Question

si x+y = 10, xy=5 calcule x^2+y^2​

Answer 1

Explicación:

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

${x}^{2} + 2ab + {b}^{2}$

${x}^{2} + 2(5) + {y}^{2} = 25$

${x}^{2} + 10 + {y}^{2} = 25$

${x}^{2} + {y}^{2} = 15$

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