Question

Gual dos números abaixo verifica a igualdade 5×3+2×2-2×+1=0?

Answer 1

5×3+2×2-2×+1=0

15 + 4 -2 x +1 = 0

20 -2 x =0

-2x= -20

x = 10

Answer 2

15 + 4 -2x +1 = 0
20 -2x = 0
-2x = 0 -20
-2x = -20 . (-1)
2x = 20
x = 20/2
x = 10.