Question

2) O valor de y na equação exponencial 3 y + 2 = 1/81 é:
(A)Y = - 2 (B) y = - 3 (C) y = 6 (D) y = 1/6 (E) y = – 6

Answer 1

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$\sf 3^{y+2}=\dfrac{1}{81}\\\sf 3^{y+2}=3^{-4}\\\sf y+2=-4\\\sf y=-2-4\\\huge\boxed{\boxed{\boxed{\boxed{\sf y=-6}}}}$