Carl is deriving the quadratic equation by completing the square. His work at one of the steps is shown. x + b/na = + or – b^2-4ac. Carl is

Question

Carl is deriving the quadratic equation by completing the square. His work at one of the steps is shown. x + b/na = + or – b^2-4ac. Carl is not sure what the value of n is. What value should he use to continue deriving the quadratic equation correctly? A. 1 B. 2 C. 3 D. 4

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Khoii Minh 5 months 2021-08-02T20:59:36+00:00 1 Answers 8 views 0

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  1. thongdat2
    0
    2021-08-02T21:01:33+00:00
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    Answer:

    the correct option is B. 2

    Step-by-step explanation:

    As given,

    x + \frac{b}{na} = ± √b²-4ac

    ⇒x = –\frac{b}{na} ± √b²-4ac

    As e know that the quadratic formula is

    x = \frac{-b + or - \sqrt{b^{2} - 4ac } }{2a}

    So , by comparing with the formula

    we get

    n = 2

    So, the correct option is B. 2

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )