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Topic: Please help refresh my Algebra skills (factoring & solving)
Replies: 9   Last Post: Oct 18, 1999 10:23 PM

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Physics Boy

Posts: 9
Registered: 12/6/04
Re: Please help refresh my Algebra skills (factoring & solving)
Posted: Oct 17, 1999 4:33 PM
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>If I have some nasty numbers in quadratic form, how do I factor and solve
>for the TWO answers??


>-4.9x^2+5.5x-105=0
>That factors to x(-4.9x+5.5) = -105


>What next??

You can "complete the square", by finding out what binomial squared
gives -4.9x^2 + 5.5x + A, where A isn't known.

Then, write the expression as this binomial squared, + A - A. Play
with this, and you find that the general solution to

ax^2 + bx + c = 0

is given by

-b +/- (b^2 - 4ac)^(1/2)
x = --------------------------
2a

- Physics Boy

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