## midpoint: If BC = x^2 - 18 and CD =x + 2, find x.

Geometric formulae, word problems, theorems and proofs, etc.
magperk
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Joined: Fri Aug 27, 2010 12:17 am
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### midpoint: If BC = x^2 - 18 and CD =x + 2, find x.

Please help me!!!!!!!

If BC = x^2 - 18 and CD =x + 2, find x.

I do not understand how you get rid of the square on the x. I know how to do the rest.
Thank you.

HELP!

stapel_eliz
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If BC = x^2 - 18 and CD =x + 2, find x.
What are B, C, and D? How are they related? How are midpoints involved?

Please be complete. Thank you!

magperk
Posts: 2
Joined: Fri Aug 27, 2010 12:17 am
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### Re: midpoint: If BC = x^2 - 18 and CD =x + 2, find x.

A._____.B______.C_____.D_____.E is a line. C is the midpoint of both line AE and line BD.

stapel_eliz
Posts: 1628
Joined: Mon Dec 08, 2008 4:22 pm
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If C is the midpoint of BD, then what does this mean about the lengths of BC and CD?

What equation, in terms of the variable x, does this give you?

Solve the resulting quadratic equation for the value of x.

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