Question

1) Calcule o valor numérico das expressões:

a) a³ - 5 a (para a = -2)
b) x² - 2y ( para x = -3 e y =5)
c) 3a² - b² (para a = -2 e b = -7)
d) 5a² + 3ab (para a = -3 e b = 4)
e) a² + 4a (para a = 2/3)

Me ajudemmm, pfvr >:(

Answer 1

a) -2³ - 5 * -2

-8 - 5 * - 2

-8 + 10

2

b) -3² -2 * 5

-9 -2 * 5

-9 - 10

-19

C) 3 * -2² + 7²

-12 + 7²

-12 + 49

37

d)5 * -3² + 3 * -3 * 4

5 * -9 + 3 * -3 * 4

-45 + 3 * -3 * 4

-45 -36

-81

e) 2/3² + 4 * 2/3

4/9 + 4 * 2/3

4/9 + 4/1 * 2/3

4/9 + 8/3

4/9 + 8/3 = 72+12/27

84/27 (vou simplificar)

84/27 ÷ 3 = 28/9