Quote:
Originally Posted by slenderhusband
(4)(1-x-0.111)=4-4x-0.444
(-5.5)(x)=-5.5x
(-8.5)(0.111)=-0.9435
Therefore we get:
(4-4x-0.444)+(-5.5x)+(-0.9435)=0
Which can be written as:
(3.556-4x)-5.5x-0.9435=0=>3.556-0.9435=4x+5.5x=>2.6125=9.5x=>2.6125/9.5=x=>x=0.275
Thanks. However, due to my extremely limited knowledge of algebra, I still couldn't figure it out from your answer. All I knew was that you have to get X on both sides of the = sign & then reduce X to 1.
For those with the same limited algebra skills as I, here is the answer I got from the probability forum:
Here: (4)(1-x-0.111)=4-4x-0.444 & (-5.5)(x)=-5.5x
What he is doing is multiplying the (4)* the integers in the 2nd parenthesis & the same with -5.5*x
So, you also multiply (-8.5)(0.111) & get -0.9435
Now you have the equation:
4-4x-0.444-5.5x-0.9435 = 0
Now you need to get the total of X on both sides of = so add the Xs together:
4-9.5x-.444-.9435 = 0
Now you need to remove the X from the left side of = & move it to the right. The reason for doing this is to get X on one side by itself.
So you add +9.5x to both sides & you get:
4-.444-.9435 = 9.5x
Now add the integers on the left side
2.6125 = 9.5x
Now reduce X to 1x by dividing 9.5x by 9.5. Remember that when you do something with X you have to do the same thing on the other side. That's how we got 9.5x on the right side.
So, 2.6125/9.5 = 0.275 = 1x
This is as basic of an algebra equation as you can get I think. So, in order for me to get thru this book - I'm going to have to watch Khan Academy videos on youtube.