Given that y=1/x^2,find dy/dx when x=2,hence,estimate the value of a)1/1.98^2
Just to double check my answer
@ganeshie8 @hartnn

Question

Given that y=1/x^2,find dy/dx when x=2,hence,estimate the value of a)1/1.98^2
Just to double check my answer
@ganeshie8 @hartnn

anonymous · Answer

is there any other method to check whether my answer is correct for this question ?

hartnn · Answer

calculator.

anonymous · Answer

a calculator wouldn't be correct in the sense that they expect us to calculate the estimate instead of the actual value.

anonymous · Answer

so show your attempt, and simply ask us if it's correct. :)

hartnn · Answer

as if, the calculator will say that the answer is 0.255076...
and we get dy = +0.05
so y= 0.255 and hence we can be quite sure our estimate is correct.

anonymous · Answer

so,i just need to press this value$$\frac{ 1 }{ 1.98^2 }$$ into the calculator ?

hartnn · Answer

yup

anonymous · Answer

Thank you @hartnn

anonymous · Answer

Thanks @Beauregard

anonymous · Answer

For what? Didn't really help here, lol

anonymous · Answer

U gave me metal :P
That's why i'm thanking u :) 
lol