Fundamentals

Algebra Level 1

We know that 1 2 = 1 3 1^2 = 1^3 . Does this imply 2 = 3 2 = 3 ?

Yes No

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1 solution

Nick Vandermeeren
Dec 16, 2017

The first equation is only true when the base of the power is 1 or 0. 1 to any power is always equal to 1 and 0 to any power (excluding 0) is also equal to 0.

However when we generalize the equation that the base and exponent can be any (real) number; a^p = a^q it is only true if p and q are the same.

Thus giving us the implication: IF a^p = a^q THAN p = q (in symbols: a^p = a^q => p = q)

We use a truth table to determine when an implication is true or false. As you can see, an implication is only false when the second statement is false and the first statement is true.

Since 1^2 is indeed equal to 1^3, the first statement is true. But since 2 is not equal to 3 the second statement is false, making the whole statement false.

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