Question

Sabendo que 3^y+2=81 e 36^x-2=6^x-1 calcule o valor de x-y e marque a alternativa correta A0 B1 C2 D3 E4

Answer 1

Seu enunciado está bem confuso.

Na proxima deixe o expoente entre chaves { }.

$3^{y+2}=81\\\\3^{y+2}=3^4\\\\y+2=4\\\\y=2\\\\\\36^{x-2}=6^{x-1}\\\\6^{2^{x-2}}=6^{x-1}\\\\6^{2.(x-2)}=6^{x-1}\\\\6^{2x-4}=6^{x-1}\\\\2x-4=x-1\\\\2x-x=-1+4\\\\x=3\\\\\\x-y=3-2=1$

Resp: 1