Question

me ajudem por favor

Answer 1

1) f(x) = -3x - 60 => -3x - 60 = 0 => -3x = 60 =>  -x = 20 (-1) => x = -20       

2) f(x) = 4x + 80 => 4x + 80 = 0 => 4x = - 80 => x = -20

3) f(x) = 3x - 90 => 3x - 90 = 0 => 3x = 90 => x = 30

4) f(x) = 100x - 300 => 100x - 300 = 0 => 100x = 300 => x = 3

5) f(x) = - 400x + 100 => - 400x + 100 = 0 => -400x = -100 => x = 1/4