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Thread: Quadratic formula Quadratic equation

  1. #1
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    Quadratic formula Quadratic equation

    I don't know where i'm going wrong on this question ( question # 8 )
    Quadratic formula Quadratic equation-question-8.jpg

    Quadratic formula Quadratic equation-unit11-number-8-edited.jpg
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  2. #2
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    Re: Quadratic formula Quadratic equation

    $3x^2 - 7x + 2 = 0$

    $a=3,~b=-7,~c=2$

    $r_1,r_2 = \dfrac{7\pm \sqrt{(-7)^2 - (4)(3)(2)}}{(2)(3)}$

    $r_1,r_2 = \dfrac{7 \pm \sqrt{49 - 24}}{6}$

    $r_1,r_2 = \dfrac{7 \pm \sqrt{25}}{6}$

    $r_1,r_2 =\dfrac{7\pm 5}{6}$

    $r_1,r_2 = \dfrac{12}{6},~\dfrac{2}{6}$

    $r_1,r_2 = 2,~\dfrac 1 3$
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  3. #3
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    Re: Quadratic formula Quadratic equation

    OOOh! You're suppose to get the square root of 25 before i divide by six
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  4. #4
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    Re: Quadratic formula Quadratic equation

    You appear to have done that. The odd thing is that you seem to have \sqrt{25}= 5\sqrt{5} which is, of course, wrong.
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