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If f(x) = x² and g(x) = 2x the fog(x) = _____?

If f(x) = x² and g(x) = 2x the fog(x) = _____?

Explanation

f(x) = x², g(x) = 2x, so

fog(x) = f(g(x)) = f(2x) = (2x)² = 4x²