Question

Dada a função f(x) = -2x + 4, determine o valor de x de modo que: a) f(x) = -2 b) f(x) = 4 c) f(x) = 5/2

Answer 1

a) -2 = -2x + 4

2x = 4 + 2

x = 6/2

x = 3

b) 4 = -2x + 4

2x = 4 - 4

x = 0/2

x = 0

c) 5/2 = -2x + 4

2x = 4 - 5/2

4x = 8 - 5

4x = 3

x = 3/4