4ˇ(x+1)+5=24.2ˇ(x-1)
4ˇx.4ˇ1+5=24.2ˇx.2ˇ(-1)
4.4ˇx +5 = 12.2ˇx
4.(2ˇx)ˇ2-12.2ˇx+5=0
2ˇx=t
4t²-12t+5=0, D=144-80=64, √D=√64=8
a)t1=(12+8)/8=20/8=5/2
2ˇx=5/2, x.log 2 = log 5 - log2, x= (log 5 - log 2)/log 2
b)t2=(12-8)/8=4/8=1/2
2ˇx=1/2, 2ˇx= 2ˇ(-1), x=-1