Question

Please solve
91 and 92.........​

Answer 1

91) let 2^x be t

t*32=t*8+12

t*24=12

t=1/2

2^x=1/2

x=-1

92)

it means f(a)=4

a^2+2a^2+a^2=4

4a^2=4

a=+-1