Question

5. Resolva a expressão abaixo: (1 ponto) (4x − 3) 2 + (4 + 3x) 2 + (7 + 5x)(7 − 5x) =

Answer 1

Resposta:

$-25x^2+14x+51$

Explicação passo a passo:

$\left(4x-3\right)\cdot \:2+\left(4+3x\right)\cdot \:2+\left(7+5x\right)\left(7-5x\right)$

$=2\left(4x-3\right)+2\left(4+3x\right)+\left(7+5x\right)\left(7-5x\right)$

$=8x-6+\left(4+3x\right)\cdot \:2+\left(7+5x\right)\left(7-5x\right)$

$=8x-6+8+6x+\left(7+5x\right)\left(7-5x\right)$

$=8x-6+8+6x+49-25x^2$

$=-25x^2+14x+51$