3)2^x=t
8t-t/2=60
7.5t=60
t=8
2^x=8
x=3
4)2^x=t
t^2-17t+16=0
D=289-64=225
t1=(17+15)/2=16; x1=4
t2=1;x2=0
5)1=8^0
2x^2-7x-4=0
D=49+32=81
x1=(7+9)/4=4
x2=-1/2
3)2^x=t
8t-t/2=60
7.5t=60
t=8
2^x=8
x=3
4)2^x=t
t^2-17t+16=0
D=289-64=225
t1=(17+15)/2=16; x1=4
t2=1;x2=0
5)1=8^0
2x^2-7x-4=0
D=49+32=81
x1=(7+9)/4=4
x2=-1/2