Last Activity: 14 Years ago
cube root of a number p is given by p1/3,p1/3w,p1/3w2.
Last Activity: 14 Years ago
One of the method you may use is differential approximation
f(x + $x) - f(x) = f/(x) . $x --------------------------(1)
for eg
Find cube root of 126
Let x =125 and $x = 1
Let f(x) = x1/3
=> f/(x) = 1/3 x-2/3
From (1)
f (126) - f(125) = 1/3 (125-2/3) . 1
=> 1261/3 - 1251/3 = 1/3 . 1/25
=> 1261/3 = 5 + 1/75 = 5.0133
You can check its truth by calculator
Note - You can use this method to find even hihger order roots or even values of tan 46 etc.
Thanks
Prepraring for the competition made easy just by live online class.
Full Live Access
Study Material
Live Doubts Solving
Daily Class Assignments
Get your questions answered by the expert for free
Last Activity: 2 Years ago
Last Activity: 2 Years ago
Last Activity: 2 Years ago
Last Activity: 2 Years ago
Last Activity: 3 Years ago