Answer:
x = -6, x = 2
Step-by-step explanation:
I find it useful to graph the function when looking for x-intercepts. The graph shows them to be x = -6 and x = 2.
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You can also factor the equation to find the x-intercepts. Those are the values of x that make the factors be zero. The constants in the binomial factors are the divisors of -12 that have a sum of +4. Those are 6 and -2.
f(x) = (x +6)(x -2)
The values of x that make these factors zero are ...
x = -6, x = 2
