Răspuns: x = 0
Explicație pas cu pas:
[tex]\bf{2 {}^{x} + 2 {}^{x + 1} + 2 {}^{x + 4} = 19}[/tex]
[tex]\bf{(1 + 2 + 2 {}^{4} ) \times {2}^{x} = 19}[/tex]
[tex]\bf{(1 + 2 + 16) \times {2}^{x} = 19}[/tex]
[tex]\bf{19 \times {2}^{x} = 19 }[/tex]
[tex]\bf{2 {}^{x} = 1 < = > {2}^{x} = {2}^{0} \Rightarrow \: \boxed{ \: \bf{x = 0}}\: }[/tex]
