The point (2, 4) is on the graph of f(x) = x2. What is the value of b if the point (0.5, 4) is on the graph of f(bx)?

Since f(x) = x², the value of f(bx) is (bx)². For the point (0.5, 4) to be on its graph, (0.5b)² must equal 4, so 0.5b = ±2 and b = ±4. Of the choices, 4 is listed, so the correct choice is A) 4.

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