Răspunsuri

2014-10-28T08:05:00+02:00
3^{x+3}·4^{x+1}-5·3^{x}·4^{x}=1236
3^{x}·3^{3}·4^{x}·4-5·3^{x}·4^{x}=1236
3^{x}·4^{x}·(3^{3}·4-5)=1236
(3·4)^{x}·(27·4-5)=1236
12^{x}·(108-5)=1236
12^{x}·103=1236
12^{x}=1236:103
12^{x}=12⇒x=1
3^{x} inseamna 3 la puterea x