. Se f(x) = 5x + 10, calcule os valores de X sabendo que:
a) f(x)=0
b) f(x) =11
c) f(x) = -1/2
d) f(X) = 20
e) f(x) = 15
f) f(X) = -15
Respostas
a) f(x)=0
5x + 10 = 0
5x = - 10
x = -10/5
x = -2
b) f(x) =11
5x + 10 = 11
5x = 11 - 10
5x = 1
x = 1/5
c) f(x) = -1/2
5x + 10 = -1/2
5x = -10 - 1/2
5x = -20/2 - 1/2
5x = -21/2
x = - 21/10
d) f(X) = 20
5x + 10 = 20
5x = 20 - 10
5x = 10
x = 10/5
x = 2
e) f(x) = 15
5x + 10 = 15
5x = 15 - 10
5x = 5
x = 5/5
x = 1
f) f(X) = -15
5x + 10 = -15
5x = -15 -10
5x = -25
x = -25/5
x = -5
a) f(x) = 0
5x + 10 = 0
5x = - 10
x = - 10/5
x = - 2
b) f(x) = 11
5x + 10 = 11
5x = 11 - 10
5x = 1
x = 1/5
c) f(x) = - 1/2
5x + 10 = - 1/2
5x = - 1/2 - 10
5x = - 21/2
x = - 21/2 ÷ 5
x = - 21/2 × 1/5
x = - 21/10
d) f(x) = 20
5x + 10 = 20
5x = 20 - 10
5x = 10
x = 10/5
x = 2
e) f(x) = 15
5x + 10 = 15
5x = 15 - 10
5x = 5
x = 5/5
x = 1
f) f(x) = - 15
5x + 10 = - 15
5x = - 15 - 10
5x = - 25
x = - 25/5
x = - 5
Espero que tenha ajudado você!