Final answer:
To solve for a when f(x) = 6, substitute f(x) with 6 in the equation f(x) = -4x - 2 and solve for x. The value of x will be -2.
Step-by-step explanation:
To solve for a when f(x) = 6, we substitute f(x) with 6 in the given equation f(x) = -4x - 2.
So, -4x - 2 = 6.
Now, we can solve this equation for x: -4x = 8, x = -2.
Therefore, when f(x) = 6, the value of x is -2.
Learn more about solving equations and finding values