Excluzând exercitiile 1 și 5 vă rog.

[tex]\it 2)\ 4^{x+3}=64 \Leftrightarrow 4^{x+3}=4^3 \Leftrightarrow x+3=3 \Leftrightarrow x=0\\ \\ 3)\ 2^{x^2+x+1}=8 \Rightarrow \ 2^{x^2+x+1}=2^3 \Rightarrow x^2+x+1=3|_{-3} \Rightarrow x^2+x-2=0 \Rightarrow \\ \\ \Rightarrow x^2-x+2x-2=0 \Rightarrow x(x-1)+2(x-1)=0 \Rightarrow (x-1)(x+2)=0\Rightarrow[/tex]
[tex]\it \Rightarrow \begin{cases}\it x+2=0 \Rightarrow x_1=-2\\ \\ \it x-1=0\Rightarrow x_2=1\end{cases}[/tex]
2. 4^(x+3) = 4^3
x+3 = 3
x = 0
3. 2^(x²+x+1) = 2^3
x²+x+1 = 3
x²+x-2 = 0
Delta = 1-4*1*(-2) = 9
x1 = (-1+3)/2 = 2/2 = 1
x2 = -2
4. C.E. x-6>=0
√(x-6) = 5 | ( )²
x-6 = 25
x = 31 verifica conditia
6. C. E. x²-x+2 >0
√(x²-x+2) = 2 | ( )²
x²-x+2 = 4
x²-x-2 = 0
Delta = 1-4*1*(-2) = 9
x1 = (1+3)/2 = 2
x2 = (1-3)/2 = -1
Ambele solutii convin.
7. C. E. x+3 >0
log2 ( x+3) = log2 (16)
x+3 = 16
x = 13 verifica conditia
8. C.E. 2x-1>0
log3 (2x-1) = log3 (9)
2x-1 = 9
2x = 10
x = 5 verifica conditia