Question

8-calcule o valor numerico das expressões: a)2a+3b, para a=1/2 e b=2/3;
b)x^2+2x,para x= -5;

Answer 1

a) 2a + 3b = 2 * (1/2) + 3 * (2/3) = 2/2 + 6/3 = 1 + 2 = 3

b) x² + 2x = (-5)² + 2* (-5) = 25 - 10 = 15

Answer 2

a) 2a +3b=
2.1/2 + 3.2/3=
2/2 + 6/3=
1 + 2= 3

b) x^2 + 2x=
(-5)^2 +2.(-5)=
25 -10=
15