Question

Calcule o valor número das expressões

a) 2a + 3b,para a = -2 e b = 3

b) x² + 2x,para x = -5

Answer 1

a) 2×(-2) + 3×3

-4 + 9 = 5

b) 25 + 2×5

25+10 = 35

Answer 2

2a+3b

2.(-2)+3.3

-4+9

5

X^2+2x

-5^2+2.(-5)

25-10

15