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

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

Postby magperk on Fri Aug 27, 2010 12:25 am

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!
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Postby stapel_eliz on Fri Aug 27, 2010 12:52 am

magperk wrote: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! :wink:
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Re: midpoint: If BC = x^2 - 18 and CD =x + 2, find x.

Postby magperk on Fri Aug 27, 2010 1:17 am

A._____.B______.C_____.D_____.E is a line. C is the midpoint of both line AE and line BD.
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Postby stapel_eliz on Fri Aug 27, 2010 12:40 pm

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. :wink:
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