Exponents

[nycmathguy]

9^20 + 9^20 + 9^20

Let me see.

Factor put 9^20.

9^20(1 + 1 + 1)

9^20 (3)

Express 9 as 3^2.

Express 3 as 3^1.

(3^2)^20 (3^1)

3^(40) (3)^1

3^(40 + 1)

3^(41) is my answer.

You say?

 

[MathLover1]

9^20 + 9^20 + 9^20=3*9^20=3*(3^2)^20=3*3^40

 

[nycmathguy]

9^20 + 9^20 + 9^20=3*9^20=3*(3^2)^20=3*3^40

I am wrong?