Simplification

**Simplicity** · April 29th 2008, 04:53 AM

What does $-2 = x \tan 45 ^\circ - \frac {9.8 \times x^2}{2 \times 14^2}$ give for the value of $x$ ? I did this but am not getting the correct value of $x$ so can someone show me the value of $x$ that you are obtaining?

**Moo** · April 29th 2008, 04:56 AM

Hello,

There are two possible values for x...

You can simplify tan(45) into 1.

So it yields -784=392x-9.8x²

Edit : x=4.19 or x=-1.91

**Kai** · April 29th 2008, 05:11 AM

Originally Posted by Moo

Hello,

There are two possible values for x...

You can simplify tan(45) into 1.

So it yields -784=392x-9.8x²

Edit : x=4.19 or x=-1.91

Ermm i did get -1.91 but got 41.9 for the other value

Edit : @ Air, to check ur answers u can simply replace the value of x u obtained back in the formula to check if it holds

**Moo** · April 29th 2008, 05:14 AM

Originally Posted by Kai

Ermm i did get -1.91 but got 41.9 for the other value

Edit : @ Air, to check ur answers u can simply replace the value of x u obtained back in the formula to check if it holds

Yes, the point didn't want to got at its correct place

Thanks

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