Question

si x+y = xy =3


Halle
x³ + y³- 1​

Answer 1

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

$27 = {x}^{3} + {y}^{3} + 3xy(x + y)$

$27 = {x}^{3} + {y}^{3} + 3 \times 3 \times 3$

$27 = {x}^{3} + {y}^{3} + 27$

${x}^{3} + {y}^{3} = 0$

${x}^{3} + {y}^{3} - 1 = - 1$