Question

Si: P(x, y) = (2x+y)2 + (2x - y)2; Calcular: P(-1, -2)
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Answer 1

Respuesta:

16

Explicación:

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

$4 {x}^{2} + 4xy + {y}^{2} + 4 {x}^{2} - 4xy + {y}^{2}$

$8 {x}^{2} + 2 {y}^{2} = 8( - 1 {)}^{2} + 2( - 2 {)}^{2}$

$8(1) + 2(4) = 8 + 8 = 16$