Use the quadratic formula to solve for x. 6x²-3x=1 Round your answer to the nearest hundredth. If there is more than one s

Question

Use the quadratic formula to solve for x.
6x²-3x=1
Round your answer to the nearest hundredth.
If there is more than one solution, separate them with commas.

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Thiên Thanh 4 years 2021-08-24T12:13:27+00:00 1 Answers 4 views 0

Answers ( )

  1. minhkhue
    0
    2021-08-24T12:15:03+00:00
    Reply

    If we know the quadratic formula, the quadratic formula is

    x = [-b ± √(b²- 4ac)] / 2a

    Gosh! So overwhelming! But let’s look at the composition of a quadratic equation:

    ax² + bx + c = 0

    And we have 6x² – 3x = 1. So, what do we do? We need to put this quadratic equation into an easy form to find the value of a, b, and c to plug in to the equation.

    We can just minus one on both sides to get this:

    6x² – 3x – 1 = 0

    Is it in the form of ax² + bx + c? Yes! a = 6, b = -3, and c = -1. Now, all we have to do is plug it into the quadratic formula.

    x = [-b ± √(b²- 4ac)] / 2a

    x = [-(-3) ± √((-3)²- 4(6)(-1))] / 2(6)

         [3 ± √(9- 4(6)(-1))] / 12

         [3 ± √(9 + 24)] / 12

         [3 ± √(33)] / 12

    At this point, we should just use a calculator, and recognize we have two answers because of the plus-or-minus sign! (or this sign: ±)

    [3 ± √(33)] / 12

    1) [3 + √(33)] / 12 = 0.73 approximately

    2) [3 – √(33)] / 12 = -0.23 approximately

    So, x=0.73 and x= -0.23.

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