a] 4 mũ x+5 = 4 mũ 20 b] 7 mũ x+1= 7 mũ 5 c] 3 mũ 4-x = 9 d] 2 mũ x-1 =32 please

`a) 4^x+5 = 4^20`

`⇔ x + 5 = 20`

`⇔ x = 20 - 5`

`⇔ x = 15`

`b) 7^x+1 = 7^5`

`⇔ x + 1 = 5`

`⇔ x = 5 - 1`

`⇔ x = 4`

`c) 3^4-x = 9`

`⇔ 3^4-x = 3^2

`⇔ 4 - x = 2`

`⇔ x = 4 - 2`

`⇔ x = 2`

`d) 2^x-1 = 32`

`⇔ 2^x - 1 = 2^5`

`⇔ x - 1 = 5`

`⇔ x = 5 + 1`

`⇔ x = 6`

`@Lyn`