Question

2×2La puterea x=4la putereax-2

Answer 1

[tex] 2*2^{x} = 4^{x-2} 2* 2^{x} = 2^{2(x-2)} = 2^{2x} * 2^{-2} notam 2^{x} =t, 2t= t^{2} * \frac{1}{2} 4t= t^{2} t^{2} -4t=0 t(t-4)=0 t=0, 2^{x} =0 nu are solutii t=4, 2^{x}= 4, x=2 [/tex]