SAT Math: Plugging in Zeroes and Cross-Multiplying to Find an Unknown Variable

In the system of equations shown above, if one of the zeros of the quadratic equation is at x = -2, and c and d are constants, what is the x-value of the other zero?

Passport to Advanced MathRadical and rational equations in one variable
Product TypeSAT Math
SAT MathAlgebra and Functions
Passport to Advanced Math
Test PrepSAT Math