Hi everyone With ref. to the above,it"s o.k.for the first 4 steps.It then uses fn. of a fn.rule for integ,which is also Ok.How does 50 appear before the integ.symbol in the next step out of thin air?Also,how does the -ve sign appear before 50 in the next step?Pl.help,i"m drowning.
That perplexed me for a while, however I figured out why. The clue is in the tip at the bottom of page 15. You need to turn the (0.5t+2) into -(.01t +.04t) to use the integration rule on the bottom of page 15. What better way to do that than to divide (0.5t+2) by 50..which gives you .(01t+0.04), hence you need to multiply the integral by 50 in order to keep it as originally intended. However this is not all we need to do in order to satisfy the rule quoted at the bottom of page 15. We need the expression (.01t+0.04) to be -(.01t+.04) In order to achieve this and keep the expression as originally intended you need to put a - in front of the 50, hence -50! Cheers Richard
