Răspuns:
D=R
x-2=0 x=2
2ˣ-1=0
2ˣ=1 x=0
8-2x=0
8=2x
x=4
Tabloul de semne
x l-∞ 0 2 4 +∞
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x-2 l- - - - - - - - - 0 + + + +
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2ˣ-1 l- - - - - -0+ + + + + + +
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8-2x l+ + + + + + + +0-- - - - - -
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f(x) l+ + + + 0- - - 0 + + + +0- - - -
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f(x)>0 pt x∈(-∞, 0)∪(2,4)
f(x)≤) pt x∈[0,2]U[4,+∞)
Explicație pas cu pas:
