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Math Help - Adding and subtracting exponents help

  1. #1
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    Adding and subtracting exponents help

    Ok, I really need help with his these steps work, and what to do ect. I have no idea what to do when it comes toadying or subtracting exponents, I just know that the index, and radicands must be the same, what do I do if they are different, what do I do if there is no coefficient ct. The question is the square root of seven, minus the square root oof 28 plus 3 times the square root of 63.
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  2. #2
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    Re: Adding and subtracting exponents help

    Quote Originally Posted by xXplosionZz View Post
    Ok, I really need help with his these steps work, and what to do ect. I have no idea what to do when it comes toadying or subtracting exponents, I just know that the index, and radicands must be the same, what do I do if they are different, what do I do if there is no coefficient ct. The question is the square root of seven, minus the square root oof 28 plus 3 times the square root of 63.
    Hint rad28= 2rad7
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  3. #3
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    Re: Adding and subtracting exponents help

    Quote Originally Posted by xXplosionZz View Post
    ...The question is the square root of seven, minus the square root oof 28 plus 3 times the square root of 63.
    If I understand your question correctly you want to simplify

    \sqrt{7} - \sqrt{28} + 3 \sqrt{63}

    Factor (if possible) and determine partially the square-root:

    \sqrt{7} - \sqrt{4 \cdot 7} + 3 \sqrt{9 \cdot 7}

    You should come out with 8\sqrt{7}
    Thanks from xXplosionZz
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  4. #4
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    Re: Adding and subtracting exponents help

    Thank you very much, it was the part where I had to square root the 4 and the 9, then multiply those by the coefficient which I drew a blank, and then proceed to add/ subtract.
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