If f(x) = x2 – 2x and g(x) = 6x + 4, for which value of x does (f + g)(x) = 0?

Add the functions: (f + g)(x) = (x² − 2x) + (6x + 4) = x² + 4x + 4. Factor to get (x + 2)², which equals zero when x = −2. The correct choice is −2.

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