Question: Solve the expression 7x(3 + 2x) - 4x(5 - x) using the distributive property.
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What is the amplitude, period, and phase shift of the cosine function f(x) = cos x?
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What is the vertex form of a quadratic function if its vertex is at (-3, 4)? (Hint: The vertex form is given by f(x) = a(x-h)^2 + k, where (h, k) is the vertex)