For this case, the first thing we must do is define a variable. We have then: x: real number Now we write the expression: -8 / (x + 3) The number x can be all real different from minus three. Answer: -8 / (x + 3) With x different from -3.
Note that h(x) = 4x^2 - 8x - 60 factors to 4(x^2 - 2x - 15), and that the roots (zeros) of (x^2 - 2x - 15) are -5 and +3. Thus, the smallest zero is -5.