?

Is the solution to the equation (x^2 - 9) + (2x + 5) - 4 = 0 is also the solution to the equation |x^2 - 9| + |2x + 5| - 4 = 0?

If not, why not? Please explain.

Prove by M. I. that

1 - 1/2 + 1/3 - 1/4 + ......+ 1/(2n + 1) - 1/(2n + 2) = 1/(n + 2) + 1/(n + 3) + ..... + 1/(2n + 2)

Hyzaar and Methyldopa are both used to treat high blood pressure, which one is better, safer and cheaper?

Is it true that 楊桃 is bad for the 腎臟 ? If yes, how bad?

Can someone tell me what was the IPO price of 3998? Thanks.

Understand that there are DVD + R and DVD - R disc, what is the difference between the two? Under what condition we should choose + R or - R? Can some experts teach me? Thanks.

When I connect my notebook computer to a HDTV via a HDMI cable (the computer has a HDMI output terminal), there is picture but no sound! What is the problem? Do I need to change some setting of the computer to get the sound to the TV? Please help, thanks.

I bought a new notebook computer, unfortunately I forgot the router password , how can I connect the new computer to the router? Is it possible to get the password from the old notebook ? How? Please help.

(The new notebook computer suggested to press the arrow button on the router for connection, I tried but not successful).

I decided to buy a 37" HD ( 1080) TV without built-in decoder. Japanese brand is preferred. What is the best suggestion? What will be the price? Please help.

My main usages of notebook are playing games(not very sophisticated one, but could be in English, Chinese or Japanese), web search/browse and data processing (using Word and Excel).

Now I would like to buy a notebook, please give me some advice on the following:

1) Should it be Window 7 or Window Vista? Is Window 7 has obvious advantage over Window Vista for my usages?

2) Is notebook with Window 7 more expensive? If yes, is it justified to pay more for the above usages?

Please help, thanks.

The label on the bottle of multivitamin stated usage is one tablet per day, if I take one tablet only every 3 days, what will be the effect? Is it still effective?

What causes low blood pressure ( 95, 65)? Any methods to avoid? It happens mostly around 5 pm.

Where can I get the complete list of road signs in Hong Kong? Is there any website showing this?

I would like to buy a router, please recommend the best choice under the following conditions:

1. Home use for 1 desk top computers and 2 notebooks.

2. Flat area 660 sq.ft.

3. Budget : a) under $400, b) $400 - $600

4. Wireless G or Wireless N is suggested ?

5. Reliable and stable.

Thanks.

All kinds of nuts ( peanut, walnut, hazelnut etc ) are high in LD chorlesterol? Is this true?

Please recommend the best high definition TV available in the market under the following conditions:

1) pixel 1080p

2) LCD, not plasma.

3) With built - in HD TV reception tuner.

4) Japanese brand or Samsung.

5) 37"

6) Good reliability.

For a certain function f(x), f(a) + f(d) = f(c) + f(b) and a> b > c > d > 0.

Also f"(x) < 0 and f'(x) > 0 for all x > 0.

Prove that f[(a+d)/2] > f[(c +b)/2]. Please help.

2 circles of diameter 1 cm and 2 cm are inscribed in a circle of diameter 3 cm. What is the diameter of the largest circle that can be put in the space between these 3 circles?