You can put this solution on YOUR website! Given:
. <=== call this equation 1
.
Next you need to find . What this means is you return to and
you replace every x in that equation with . When you do that replacement you get:
. <=== call this equation 2
.
To simplify this you need to square the on the right side. Do this by multiplying:
.
.
Substitute into equation 2 in place of and equation 2 becomes:
. <=== call this equation 3
.
The problem asked you to find . From equation 3 we know that:
.
.
and from equation 1 we know:
.
.
So we substitute the right side of these two equations into in place
of and to get:
.
.
On the right side, since the set of parentheses are preceded by a minus sign, the parentheses
can be removed if we change the signs of the two terms in the parentheses. This makes the
equation become:
.
.
Now on the right side you can notice that the +2 and the -2 cancel each other as does the and the . Those terms, therefore, disappear and you are left with:
.
.
Hope this helps you to understand the problem a little more.
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