Use Descartes' Rule of Signs and the Rational Zeros Theorem to find all the real zeros of the polynomial function. Use the zeros to factor f over the real numbers. f(x) = x4 + 21x2 - 100
A. -5, 5; f(x) = (x - 5)(x + 5)(x2 + 4)
B. -2, -5, 2, 5; f(x) = (x - 2)(x + 2)(x - 5)(x + 5)
C. 2; f(x) = (x - 2)2(x2 + 25)
D. -2, 2; f(x) = (x - 2)(x + 2)(x2 + 25)
Answer: D
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Evaluate. If necessary, find common denominators and simplify completely.4
+ 12
+ 
A. 17
B. 18
C. 16
D. 17
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