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+1 vote
1.2k views
in Cubes And Cube Roots by (49.2k points)
closed by

If 99 x 21 - \(\sqrt[3]{X}\) = 1968, then x equals 

(a) 1367631 

(b) 1366731 

(c) 1367 

(d) 111

2 Answers

+1 vote
by (49.1k points)
selected by
 
Best answer

Correct option is (a) 1367631

\(99 \times 21 -\sqrt[3]{x} = 1968\)

\(2079 - x^{\frac 13} = 1968\)

\( - x^{\frac 13} = -111\)  

\(x^{\frac 13} = 111\) 

Make cube both side

\(\left(x^{\frac 13} \right)^3 = (111)^3\) 

\(x = 1367631\)

+2 votes
by (53.1k points)

The answer is: (a) 1367631

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