Evaluate the integral (1-x)(x-4)dx on [1,4] using the fundamental theorem of calculus. I have FOIL'd it and tried to plug the end points not getting the answer it should be. help?

Question

Evaluate the integral (1-x)(x-4)dx on [1,4] using the fundamental theorem of calculus.  I have FOIL'd it and tried to plug the end points not getting the answer it should be. help?

shayaan_mustafa · Answer

Hi ChukRock ! :)

Need help?

anonymous · Answer

yes please. i have foil'd and integrated but i cant seem to get the correct answer.

shayaan_mustafa · Answer

Can you kindly show your work. Because I am stuck many places at once. So contribute please. Thank you buddy.

anonymous · Answer

sure i will take a pic and upload

shayaan_mustafa · Answer

OK good.

anonymous · Answer

attachment

anonymous · Answer

where did the negative sign on your x^{2} go?

anonymous · Answer

oops let me try that

shayaan_mustafa · Answer

Sorry. Due to internet problem I was log off. And I have seen. you missed -ve sign friend.

anonymous · Answer

that was it thanks, just needed an outside perspective

shayaan_mustafa · Answer

Yeah. Good luck.