2-4-15
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OK, to do this long division, any place that I don't have a
term, I'm going to put in a placeholder with A0X.
So there's my X ^2.
I didn't have any XS and my constant down here I didn't have
any XS or constant.
So I'm going to put a 0X and a zero.
So my first thought process should be two X squared times.
What gives me 8X to the 4th and my answer is going to be four X
^2.
So if I have four X squared and I multiply it by that two X ^2 +
0 X plus one.
If I write it over here, I can see that all I'm really doing is
the distributive property 8X to the 4th plus zero X ^3 + 4 X
squared.
We're going to then subtract or I prefer and students have less
errors made if they just change all the signs and add them.
So at this point, we're going to get fourteen X ^3 -, 2 X squared
plus 0X.
I'm going to look at the furthest to the left again.
So this two X squared now times what gives me 14X cubed and our
answer is going to be 7X.
So 7X, 7X times two X ^2 + 0 X plus one fourteen X ^3 plus zero
X ^2 + 7 X.
So that when I now subtract or change the sign so that I can
add change all the signs so that I could add them.
I'm going to get the 14X cubes to cancel negative two X ^2 - 7
X and I'm going to bring down the zero.
So once again, farthest left.
So this two X squared times, what gives me this -2 X squared?
And the answer is going to be -1 So I'm going to have that -1
times the two X ^2 + 0 X plus one.
And I'm going to get negative two X ^2 + 0 X -1.
I'm going to go through and I'm going to change all my signs so
that I can then add.
So I'm going to get -7 X plus one.
So my remainder always goes over what I was dividing by.
So seven X + 1 divided by two X ^2 + 1.