III. Determine the numberof real roots of each polynomial equation. 16) x-8= 0
17) x (x - 1)(x+2) = 0
18) (x + 1)(x-2) ?=0
19) (x + 2)(x-2) = 0
20) -5x + 4 = 0
17) x (x - 1)(x+2) = 0
18) (x + 1)(x-2) ?=0
19) (x + 2)(x-2) = 0
20) -5x + 4 = 0
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