Question

Determine a raiz das equações a seguir
a)×+12=20
b)2×-3=9
c)×-1=15
d)5×10=30
e)2×+4=-1

Answer 1

a) x + 12 = 20

x = 20 - 12

x = 8

b) 2x - 3 = 9

2x = 9 + 3

2x = 12

x = 12/2

x = 6

c) x - 1 = 15

x = 15 + 1

x = 16

d) 5x + 10 = 30

5x = 30 - 10

5x = 20

x = 20/5

x = 4

e) 2x + 4 = -1

2x = -1 - 4

x = -5/2