Question

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Answer 1

Resposta:

$a) \: 3x + 2x - 1 = 5x - 1 \\ \\ b) \: 3x(2x - 1) = 6x - 3x \\ \\ c) \: - 2 {x}^{2} + x + 4 {x}^{2} - 2x + 5 = \\ \: 2 {x}^{2} - x + 5 \\ \\ d) \: (2x - 1)( { - 2x}^{2} + x) = \\ { - 4x}^{3} + {2x}^{2} + {2x}^{2} - x \\ - {4x}^{3} + {4x}^{2} - x$

$e) \: 2x - 1 - ( - {2x}^{2} + x) \\ 2x - 1 + {2x}^{2} - x \\ 2 {x}^{2} + x - 1$

$2) \: 4 {x}^{2} - 2x + 5 \\ 4 \times {( - 1)}^{2} - 2 \times ( - 1) + 5 \\ 4 \times 1 + 2 + 5 \\ 4 + 7 \\ 11$

Explicação passo-a-passo:

Espero ter ajudado.