The equations in Exercises 72–75 have real roots that are rational. Use the Rational Zero Theorem to list all possible rational roots. Then graph the polynomial function in the given viewing rectangle to determine which possible rational roots are actual roots of the equation.

4x⁴ + 4x³ + 7x² - x - 2 = 0; [-2, 2, 1] by [-5, 5, 1]