Evaluate the integral.

Question

mony01 · Answer

$$\int\limits_{0}^{2}(2x-6)(8x ^{2}+2)dx$$

tkhunny · Answer

Have you considered simply multiplying the binomials?

mony01 · Answer

yeah my answer was 48 but it says its wrong so can you check what you get?

tkhunny · Answer

Just for the record, it does help and everyone is happier - including you - when you provide your efforts and results.  It wastes an awful lot of time making us guess.

Since the argument is negative throughout the entire interval, how did yo umanasge to get a positive number?

Number one thing I would suggest to to get the pesky constants out of there.  There appears to be an annoying factor of two in both binomials.  Factor that out and give it another go.

$4\cdot\int (x-3)(4x^{2} + 1)\;dx$

Are you sure you wrote it all correctly?

mony01 · Answer

I got it already thanks though.....oh and sorry if I made you waste your time

tkhunny · Answer

There is no time-wasting at all one we get on the same page.  Glad to be here.  It's just the unnecessary up-front guessing that could be a problem.

What did you get and how did you get it?

mony01 · Answer

I got -80 I think I forgot to include the negatives when I was subtracting and adding at the end....its funny how the simplest things make you mess up everything haha

tkhunny · Answer

Good call.  Just paying a little more attention often is a sufficient adjustment.