In order to identify the zeros of the function, a student factored the cubic function f(x) = x³ - 3x² - 10x as follows. describe and correct the error the student made.
f(x) = 3 - 3x²-10x
= x(x² - 3x -10)
= x(x - 5)(x+2)
= 0, = -5, x = 2