What is the definite integral of #x# from 0 to 3? Precalculus Limits, Motion, and Areas The Definite Integral 1 Answer AJ Speller Sep 25, 2014 #int_0^3 x dx# #=[x^2/2]_0^3# #=[(3)^2/2-(0)^2/2]# #=[(3)^2/2-(0)^2/2]# #=[9/2-0/2]# #=[9/2]# #=4.5# Answer link Related questions What is the definite integral of #x^2# from 0 to 4? What is an indefinite integral? What is a definite integral? What is the definite integral of #ln x# from 0 to 1? How do I find a definite integral by computing an area? How can a definite integral be negative? How do I find a definite integral on a TI-84? How do I use a definite integral to find the area of a region? What is the definite integral of #sec^4 x# from 0 to #pi/4#? What is the definite integral of #1/(36+x^2)# with bounds #[0, 6]#? See all questions in The Definite Integral Impact of this question 3776 views around the world You can reuse this answer Creative Commons License