Question

1)4cos^2x+4sinx-1=0
2)3^x+1 +2*3^x-1 =11

Answer 1

2)3ˣ⁺¹+2*3ˣ⁻¹=11
3*3ˣ+2/3*3ˣ=11
3ˣ(3+2/3)=11
3ˣ*11/3=11
3ˣ=11÷11/3
3ˣ=3
x=1