Question

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Answer 1

Resposta:

3)

a)

$2xy - {y}^{2} , \: \: para \: \: x = 2 \: e \: y = 7 \\ \\ 2(2)(7) - ( {7)}^{2} = \\ \\ = 28 - 49 \\ \\ = \Large \boxed{ \green{ \bf \: - 21}}$

b)

$x {y}^{2} + y - 2x, \: para \: \: x = 3 \: \: e \: \: y = - 4 \\ \\ ( 3)( { - 4)}^{2} - 4 - 2(3) = \\ \\ =( 3)(16) - 4 - 6 \\ \\ = 48 - 10 \\ \\ = \Large \boxed{ \green{ \bf \: 38}} \\ \\ \Large \boxed{ \underline{ \blue{ \bf \: Bons \: Estudos!}}}$