I need to write it in interval notation.
f(x) = sqrt(x(x - 8))
x(x - 8) > 0
test intervals:
(-∞, 0): let x = -1 → (-)(-)=(+)
(0, 8): let x = 1 → (+)(-)=(-)
(8, +∞): let x = 10 → (+)(+)=(+)
so
(-∞, 0)∩(8, +∞)
♣♦
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f(x) = sqrt(x(x - 8))
x(x - 8) > 0
test intervals:
(-∞, 0): let x = -1 → (-)(-)=(+)
(0, 8): let x = 1 → (+)(-)=(-)
(8, +∞): let x = 10 → (+)(+)=(+)
so
(-∞, 0)∩(8, +∞)
♣♦