Evaluating Composite Functions

Given the functions g(x)= x2 + 3 and f(x)= x2 + 5x + 7, what is f(g(x))?

x4 + 15x + 21

x2 + 5x + 21

x4 + 11x^{2} + 31

2x2 + 8x + 10

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