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Solve the inequality algebraically. (x-20)(x+20) Move all terms to the left side of the inequality and then define the left side of the inequality

Solve the inequality algebraically. (x-20)(x+20) Move all terms to the left side of the inequality and then define the left side of the inequality as f(x). Then list the intervals determined by the real zeros undefined. Complete the following table. (Type your answers in interval notation. Use ascending order.) Interval Sign

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