Question

if 3m=81 then find the value of 72m-8 write in exponent​

Answer 1

Step-by-step explanation:

[3

m

2

÷(3m)

2

]

1/m

=87

⇒ (3

m

2

÷3

2m

)

1/m

=3

4

⇒ (3

m

2

−2m

)

1/m

=3

4

⇒ 3

m

2

−23

=3

4

on equation the power we get

(since passes are same)

⇒

m

m

2

−2m

=4

m

2

−2m−4m=0

m

2

−6m

m(m−6)=0m=6

Answer 2

Answer:

Given, 3m = 81

            m = 81/3

            m = 27

Let's substitute m in 72m - 8

            ∴ 72m - 8 = 72 × 27 -8

                             = 1944 - 8

                              = 1936

                   Hope it helps you^_^