Value of ∜(81)^-2 is
a. 1/9
b. 1/3
c. 9
d. 1/81

Solution:

Given

∜(81)^-2

It can be written as

= 81^{-2 × 1/4}

= 81^-1/2

By further calculation

= (√81)^-1

= 9^-1

= 1/9

Therefore, the value is 1/9.

✦ Try This: Value of ∜(16)^-2 is

☛ Also Check: NCERT Solutions for Class 9 Maths Chapter 1

NCERT Exemplar Class 9 Maths Exercise 1.1 Problem 19

Value of ∜(81)^-2 is a. 1/9, b. 1/3, c. 9, d. 1/81

Summary:

Irrational numbers are the set of real numbers that cannot be expressed in the form of a fraction, p/q where p and q are integers. Value of ∜(81)^-2 is 1/9

☛ Related Questions:

• Value of (256)0.16 × (256)0.09 is a. 4, b. 16, c. 64, d. 256.25
• Which of the following is equal to x? a. x12/7 × x5/7, b. 12th root of x power 4 to the power one th . . . .
• Are there two irrational numbers whose sum and product both are rationals? Justify