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Math Help - Simplification

  1. #1
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    Simplification

    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?
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  2. #2
    Moo
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    Hello,

    There are two possible values for x...

    You can simplify tan(45) into 1.

    So it yields -784=392x-9.8x

    Edit : x=4.19 or x=-1.91
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  3. #3
    Kai
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    Quote Originally Posted by Moo View Post
    Hello,

    There are two possible values for x...

    You can simplify tan(45) into 1.

    So it yields -784=392x-9.8x

    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
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  4. #4
    Moo
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    Quote Originally Posted by Kai View Post
    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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