I'm stuck, what would be two inputs for this linear equation?

f(x) = x³ - 7 x = -2 x = 2

F(x) = x^3 - 7x = -2x = 2

x^3 =5x - 2 =0
square root ^3 ( x^3) = square root^3 (5x - 2)
x = square root^3 (5x - 2)