Question

Which of the following is not equal to 81?

• A. $9^2$
• B. $3^4$
• C. ${81}^1$
• D. $5^3$

Answer 1

The correct option is D $5^3$

For the base of 9 and exponent of 2, the value can be written as :
$9^2=9\times 9=81$
Hence, $9^2=81$

For the base of 3 and exponent of 4, the value can be written as :
$3^4=3\times 3\times 3\times 3=81$
Hence, $3^4=81$

For the base of 81 and exponent of 1, the value can be written as:
${81}^1=81\times 1=81$
Hence, ${81}^1=81$

For the base of 5 and exponent of 3, the value can be written as :
$5^3=5\times 5\times 5=125$
Hence, $5^3=125$
Option (d) is not equal to 81.