How to solve an absolute value integral?

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SUMMARY

The integral of the absolute value function ∫0-->x |t|dt can be evaluated as 1/2*x^2 for x ≥ 0 and 1/2*(-x)^2 for x ≤ 0. The correct expression for the integral across both domains is 1/2*x|x|, as confirmed by the textbook answer. Participants in the discussion clarified the evaluation process and addressed common misconceptions regarding the negative sign in the integral for negative values of x.

PREREQUISITES
  • Understanding of integral calculus
  • Familiarity with absolute value functions
  • Knowledge of piecewise functions
  • Basic algebra skills for manipulating expressions
NEXT STEPS
  • Study the properties of absolute value functions in calculus
  • Learn about piecewise integration techniques
  • Explore the Fundamental Theorem of Calculus
  • Practice solving integrals involving absolute values with varying limits
USEFUL FOR

Students studying calculus, educators teaching integral calculus, and anyone seeking to understand the evaluation of integrals involving absolute values.

physicsernaw
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Homework Statement



∫0-->x |t|dt

Homework Equations



//

The Attempt at a Solution



1/2*x^2 for x>= 0

1/2*(-x)^2 for x<= 0

Not sure what to do to be honest. (the answer in the back of the book says 1/2*x|x|).
 
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hi physicsernaw! :smile:

(try using the X2 button just above the Reply box :wink:)
physicsernaw said:
1/2*(-x)^2 for x<= 0

how did you get that?

it should be -1/2 x2 :smile:
 

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