-5!!!

Good question!

I'll tell you how. First, the original:

Last edited by krassi_holmz (2006-01-06 08:23:28)

3-2√5<0 so we can remove that modulus like that:
√(9-4√5)+2√5-3-3√5 =
= √(9-4√5)-3-√5 =
(this is the thin moment:)
√(9 - 4√5) = √(9 - 2.2.√5) = √((2^2+√5^2) - 2.2.√5) = √((2-√5)^2) = |2-√5| = √5-2. Substituting:

√(9-4√5)-3-√5 = √5-2-3-√5=-5

answer:-5

Last edited by krassi_holmz (2006-01-06 08:35:31)

Like this:

 [url]http://img281.imageshack.us/img281/7184/dring9ew.jpg[/url]

Which gives:
http://img281.imageshack.us/img281/7184/dring9ew.jpg

This means "power" here is it:

(this is the thin moment:)
√(9 - 4√5) = √(9 - 2.2.√5) = √((2²+√5²) - 2.2.√5) = √((2-√5)²) = |2-√5| = √5-2. Substituting:

√(9-4√5)-3-√5 = √5-2-3-√5=-5

answer:-5

Thanx alot, I've been solving this for the whole week. Now its very clear. Making 9 into 2²+√5² was very new for me. Learning everyday. Hehe

thanx again

It looks like krazzi has beaten me to the maths help, so I'll just help with the BB Code instead.

The tag is [img], it's just that you need a slash when you close it.

[img]http://img281.imageshack.us/img281/7184/dring9ew.jpg[/img]

oh, I knew I did it right, but just missed that slash