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Q: What is the fourth root of b if b equals 16?

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b = sqrt32 or 4 root 2

b. -4x2+20 = 4x2 = 4-20x2 = -16x = -4Note that -42 = -16 but (-4)2 in brackets = 16

The square root (or cubic root, or fourth root, etc.) of any positive integer can only be: a) either an integer, b) or an irrational number.

-2

36 -20 = 16

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20

(11, 5)

b. -4x2+20 = 4x2 = 4-20x2 = -16x = -4Note that -42 = -16 but (-4)2 in brackets = 16

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