Question

me ayudan por favor <3

Answer 1

Respuesta:

$a)3 {x}^{2} + x + 1 = 3 \times {( - 2)}^{2} + ( - 2) + 1 = 3 \times 4 + ( - 2) + 1 = 12 - 2 + 1 = 11$

$b) {a}^{2} + 2a + 1 = {3}^{2} + 2 \times 3 + 1 = 9 + 6 + 1 = 16$

$c) {s}^{3} + 3 {s}^{2} + 3s + 1 = {( - 1)}^{3} + 3 \times {( - 1)}^{2} + 3 \times ( - 1) + 1 = - 1 + 3 \times 1 + ( - 3) + 1 = - 1 + 3 + ( - 3) + 1 = - 1 + 3 - 3 + 1 = 0$

$d)x + y - 3 = - 2 + 1 - 3 = - 4$

$e) {r}^{2} - 3s + 2 {s}^{2} = {2}^{2} - 3 \times ( - 1) + 2 \times {( - 1)}^{2} = 4 - ( - 3) + 2 \times 1 = 4 + 3 + 2 = 9$