Question

efetue e simplifique​

Answer 1

Resposta:

$a) \: {x}^{2} - {(x + 10)}^{2} \\ {x}^{2} - ( {x}^{2} + 20x + 100) \\ {x}^{2} - {x}^{2} - 20x - 100 \\ = - 20x - 100$

$b) \: {(3x + 5)}^{2} - 9 {x}^{2} \\ 9 {x}^{2} + 30x + 25 - 9 {x}^{2} \\ = 30x + 25$

$c) \: {(2x - 1)}^{2} + x \times (3x - 2) \\ 4 {x}^{2} - 4x + 1 + 3 {x}^{2} - 2x \\ 7 {x}^{2} - 6x + 1$

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