Find all zeros of the function and write the polynomial as a product of linear factors.f(x) = x4 + 7x3 + 21x2 + 63x + 108
A. f(x) = (x + 3)(x + 4)(x - 3i)(x + 3i)
B. f(x) = (x - 1)(x - 12)(x - 3i)(x + 3i)
C. f(x) = (x - 3)(x + 4)(x - 3)(x + 3)
D. f(x) = (x - i
)(x + i
)(x - 3)(x +3)
Answer: A
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Evaluate the improper integral or state that it is divergent. 
A. -36 B. 18 C. 0 D. - 18
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Solve the given differential equation.4y" - 20y' + 25y = 0
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