Question

Calcule o zero das funções:
a) y=2x-8
b) y= 4x+20
c) y= 3x/2 -9
d) f(x)= 5x-30
e) f(x)= 5x/2 +10

Answer 1

a) y=2x-8

2x-8=0

2x=8

×=8/2

x=4

b)y=4x+20

4x+20=0

4x=-20

x=20/4

x=5

c)y=3x/2 -9

3x/2 -9 = 0

3x=-9 ×2

3x= -18

x= -18/3

x= -6

d)f (x) =5x-30

5x-30=0

5x=30

x=30/5

x=6

e)f (x) =5x/2+10

5x= 10 ×2

5x =20

x=20/5

x=4