Question

(-3)^x:81=-27

Answer 1

`@` `\text {Ans}`

`\downarrow`

\(\left(-3\right)^x\div81=-27\)

`=>`\(\left(-3\right)^x=-27\cdot81\)

`=>`\(\left(-3\right)^x=\left(-3\right)^3\cdot3^4\)

`=>`\(\left(-3\right)^x=\left(-3\right)^7\)

`=> x=7`

Vậy, `x=7.`

`@` `\text {Kaizuu lv u}`

Answer 2

(-3)^x . 81 = -27

<=> (-3)^x . (-3)⁴ = (-3)³

<=> (-3)^x+4 = (-3)³

=> x+4=3

<=>x= -1