Multiple Choice Questions

If 3x ndash 3x ndash 1 18 then the value of xx is ........

Quantitative Aptitude (RRB NTPC) Algebra

If 3^x – 3^x^–¹ = 18, then the value of x^xis:

216

From the given expression :
3^x − 3^x⁻¹ = 18
⇔ 3^x⁻¹ (3 − 1) = 18
⇔ 3^x −¹ = 9 = 3²
From the equation power :
⇔ x − 1 = 2 ⇔ x = 3.
∴ x^x = 3³ = 27

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