Question

URGENTE!!!
Calcule as expressões:

Answer 1

Resposta:

$a) \: \: 3 {x}^{2} - 2 \sqrt{y} \\ 3 \times {(1)}^{2} - 2 \sqrt{4} \\ 3 \times 1 - 2 \times 2 \\ 3 - 4 = - 1$

$b) \: \: {b}^{2} - 4ac \\ {(4)}^{2} - 4 \times 2 \times ( - 3) \\ 16 - 8 \times ( - 3) \\ 16 + 24 \\ = 40$

$c) \: {x}^{2} - y \\ {( - 2)}^{2} - ( - 5) \\ 4 + 5 \\ = 9$

$d) \: {x}^{2} - 3x \\ {(3)}^{2} - 3 \times 3 \\ 9 - 9 \\ = 0$