Question

Si: x + y =
$\sqrt{5}$

xy = 2
Halla : x3+ y3​

Answer 1

Respuesta:

$(x + y) {3} = ( \sqrt{5} ) {3}$

${x}^{3} + {y}^{3} + 3xy(x + y) = 5 \sqrt{5}$

${x}^{3} + {y}^{3} + 3(2)( \sqrt{5} ) = 5 \sqrt{5}$

${x}^{3} + {y}^{3} + 6 \sqrt{5} = 5 \sqrt{5}$

${x}^{3} + {y}^{3} = - \sqrt{5}$