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Math Help - Simplifying Surd

  1. #1
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    Simplifying Surd

    Hi

    Ive just solved a quadratic equation using the quadratic formula, but the qestion says to leave it in the form a(+ or -) root b.

    I got the answer (2(+ or -) root 84) / 2

    How can i change this to the required form? I know i can divide the 2 by 2 leaving 1 (+ or -) (root 84)/2. Not sure about the root.

    By the way sorry about the layout of the equation. I still havn't got the hang of the math code. Hopefully you still understand what i mean.
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  2. #2
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    Quote Originally Posted by nugiboy View Post
    Hi

    Ive just solved a quadratic equation using the quadratic formula, but the qestion says to leave it in the form a(+ or -) root b.

    I got the answer (2(+ or -) root 84) / 2

    How can i change this to the required form? I know i can divide the 2 by 2 leaving 1 (+ or -) (root 84)/2. Not sure about the root.

    By the way sorry about the layout of the equation. I still havn't got the hang of the math code. Hopefully you still understand what i mean.
    \sqrt{84} = \sqrt{4 \cdot 21}= 2\sqrt{21}
    Can you solve it now?
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