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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