Question

calcule o valor de x:

a) x+4= 7

b)9x=81

c) x sobre 3 =5

d) 16x= -64

Answer 1

a)x+4 = 7 :

x +4 - 4 = 7 -4

x = 3

b)9x = 81:

9x = 81

x= 81/9

x= 9

c)x/3 = 5:

x/3 = 5

MMC 3

x = 15

d) 16x = -64

16x = -64

x = -64/16

x = -4

Answer 2

a) x+4=7
x = 7-4
x= 3


b)

9x = 81
x= 81/9
x=9

c)
x/3 = 5
x = 5x3
x= 15

d)
16x = -64
x = -64/16
x = -4