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## Homework Statement

A robotic bug is moving along the x-axis. Its equation of motion is x(t) = 10*t^2- 4*t - 6

I have a problem with only one question:

What is the distance covered by the bug between t = 0.1 s and t = 0.4 s?

## Homework Equations

## The Attempt at a Solution

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The first derivative of 10*t^2- 4*t - 6 is velocity: 20*t-4

So I integrated 20*t-4 and computed the value of the integral from 0.1 to 0.4. I got 0.3 and it is wrong. I have no idea why. :(