How do I solve this equation by using the quadratic formula 3x^2-12x-27=-6

Question

How do I solve this equation by using the quadratic formula 3x^2-12x-27=-6

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Thông Đạt 5 years 2021-08-22T22:57:12+00:00 2 Answers 11 views 0

Answers ( )

  1. ngochoa
    0
    2021-08-22T22:58:18+00:00
    Reply

    Answer:

    Move all terms to the left side of the equation and simplify.

    3x²−12x−21=0

    Use the quadratic formula to find the solutions.

    (−b±√b²−4(ac))/2a

    Substitute the values a=3, b=−12, and c=−21 into the quadratic formula and solve for x.

    (12±√(−12)²−4⋅(3⋅−21)0/2⋅3 Simplify =>  x=2±√11

    The result can be shown in multiple forms.

    Exact Form: x=2±√11

    Decimal Form: x=5.31662479…,−1.31662479…

    Step-by-step explanation:

  2. binhan
    0
    2021-08-22T22:58:24+00:00
    Reply

    Step-by-step explanation:

    The quadratic equation is

    x=−b=−√b2−4ac2a

    for a quadratic taking the form

    ax2+bx+c=0

    So for this equation it is

    x=−(−12)±√(−12)2−4⋅3⋅112⋅3

    x=12±√144−1326

    x=12±√4⋅36

    x=6±√33

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