如图
如图
x(x-2)≤8 (1)
x>0 (2)
x-2>0 (3)
from (1)
x(x-2)≤8
x^2-2x-8≤0
(x-4)(x+2)≤0
-2≤x≤4 (4)
from (2)
x>0 (5)
from (3)
x-2>0
x>2 (6)
(4) and (5) and (6)
-2≤x≤4 and x>0 and x>2
=> 2
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