Wait, Those Are Different?

Algebra Level 1

Which is larger?

A. 2 3 2 2^{3^2}

B. ( 2 3 ) 2 (2^3)^2

A B A and B are equal

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3 solutions

Zach Abueg
Jan 26, 2017

2 3 2 = 2 9 2^{3^2} = 2^9

( 2 3 ) 2 = 2 6 (2^3)^2 = 2^6

2 9 > 2 6 2^9 > 2^6

Mohammad Khaza
Jul 2, 2017

2^3^2=2^9....................(a)

(2^3)^2=2^6.............................(b)

so,a>b

Zee Ell
Jan 25, 2017

A = 2 3 2 = 2 9 = 512 A = 2^{3^2} = 2^9 = 512

B = ( 2 3 ) 2 = 8 2 = 64 B = (2^3)^2 = 8^2 = 64

512 = A > B = 64 512 = A > B = 64

Hence, our answer should be:

A \boxed { A }

This would be stronger if you also addressed the mistake that people would tend to make, that is, assume that the order of operations is done the same in both cases.

Jason Dyer Staff - 4 years, 4 months ago

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What I have done, is to show how to solve the question quickly and correctly (by simply following BIDMAS/BEDMAS, that is, starting with brackets, then indices/exponents ...).

What you are suggesting, is not to follow BIDMAS/BEDMAS, yet, be careful enough to end up with the correct solution.

Something like:

B = ( 2 3 ) 2 = 2 3 × 2 = 2 6 = 64 B = (2^3)^2 = 2^{3×2} = 2^6 = 64

One might argue, which way is the stronger / more useful.

Zee Ell - 4 years, 4 months ago

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