Question

XFA AYUDA PLS PLS URGENTE​

Answer 1

Explicación paso a paso:

Binomio al cuadro

$( {x + y})^{2} = {x}^{2} + 2xy + {y}^{2} \\ ( {5})^{2} = {x}^{2} + 2(2) + {y}^{2} \\ 25 = {x}^{2} + 4 + {y}^{2} \\ {x}^{2} + {y}^{2} = 21 \\ \\ suma \: de \: cubos \\ {x}^{3} + {y}^{3} = (x + y)( {x}^{2} - xy + {y}^{2} ) \\ {x}^{3} + {y}^{3} = (5)( {x}^{2} + {y}^{2} - 2) \\ {x}^{3} + {y}^{3} = (5)(21 - 2) \\ {x}^{3} + {y}^{3} = (5)(19) \\ {x}^{3} + {y}^{3} = 95 \\ \\ r = {x}^{3} + {x}^{2} + {y}^{2} + {y}^{3} \\ r = {x}^{2} + {y}^{2} + {x}^{3} + {y}^{3} \\ r = 21 + 95 \\ r = 116$