1. therefore then

Find each root: your answer is correct.

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- August 1st 2006, 01:00 PM #1

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- August 1st 2006, 01:06 PM #2

- August 1st 2006, 01:11 PM #3
These should be explained to you better, so here I go:

If you have an equation like: than you can use the cross-product rule to say:

Radicals: Just something most people tend to not know,

therefore when you see something like you can say it equals and then use the rule of exponents to say: which simplifies to

for some reason I really don't feel like answer most of your questions now, so I'll let someone else do that.

- August 1st 2006, 02:53 PM #4

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- August 1st 2006, 03:02 PM #5

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- August 1st 2006, 03:07 PM #6

- August 1st 2006, 04:56 PM #7

- August 1st 2006, 05:08 PM #8

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- August 1st 2006, 05:15 PM #9

- August 1st 2006, 06:03 PM #10
#2 I'm having trouble understanding what the problem is with #2, since than therefore

but I assume you've done a typo somewhere...

#3

multiply both sides by and you'll get:

now think back and you'll remember that (a+b)(a-b)=(a^2-b^2).

simplify:

solve:

get rid of parentheses:

rearrange:

now use the quadratic formula:

substitute:

simplify:

simplify

use the principle square root:

subtract:

divide:

- August 1st 2006, 06:37 PM #11

- August 1st 2006, 06:49 PM #12

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- August 1st 2006, 06:59 PM #13

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- August 1st 2006, 07:04 PM #14Originally Posted by
**Chester**

Well, I'll tell you even if this isn't what you're asking...

we have equation so to change this equation the first step would be by multiply both sides by look below:

multiply both sides by :

therefore:

therefore:

so then we get:

so multiply both sides by and you get:

let's test it out:

change it around and you get:

you see? it works!

- August 1st 2006, 07:19 PM #15

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