Confused with Addition method problem?

He multiplied the whole problem by -4.

earlier I start up i would be utilising the standard unit vector notation i and j for unit vectors interior the effective x and y-guidelines so in basic terms a heads up. indoors attitude of a hexagon: (6-2)(180degrees)/6 = (2/3)(a hundred and eighty) = one hundred twenty levels permit A be the commencing place. Then AB = cos(270degres)i + sin(270degrees)j = -j i'm utilising 270 levels as a results of fact i'm assuming that the the perfect option of A is the effective x-axis, it extremely is the place the attitude is 0. additionally the attitude will advance whilst going counterclockwise so a vector pointing at once down could have an attitude of 270. BC could nicely be stumbled on by utilising first drawing a line previous AB. as a results of fact all of us be conscious of that the interior attitude of a hexagon is one hundred twenty levels (or 2pi/3 radians in case you prefer) we are able to tell that the attitude between BC and the recent line is 60 levels. Now if we've been to circulate BC at once up till the B on BC intersects with the A on AB, it's going to be obvious that BC is AB grew to become around 60 levels counterclockwise. for this reason BC is: BC = cos(270+60)i + sin(270+60)j = (sqrt(3)/2)i - (a million/2)j a similar technique may well be used to discover CD, DE, and EF. as quickly as all of those vectors have been stumbled on you will discover AC: AC = AB+BC advert: advert = AC+CD AE: AE = advert+DE AF: AF = AE+EF Then as quickly as you have stumbled on all of them you may only sum up all the i and j factors to get your very final vector. looking the value and course must be basic now as a results of fact it's going to be in standard unit vector kind.