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4^x+3×2^x=80
repede va roggg!!!!



Răspuns :

4ˣ+3×2ˣ=80
2
²ˣ+3×2ˣ=80
(2
ˣ)²+3×2ˣ=80
2
ˣ(2ˣ+3)=2⁴x5

2ˣ=2⁴⇒x=4
2ˣ+3=5⇒2ˣ=5-3⇒2ˣ=2⇒x=1