Which of the following is a solution to the quadratic equation 4x2+2x=10

? (1 point)
Responses

−2+41√4
the fraction with numerator negative 2 plus square root of 41 and denominator 4

−1−41√4
the fraction with numerator negative 1 minus square root of 41 and denominator 4

−2+92√8
the fraction with numerator negative 2 plus 9 square root of 2 and denominator 8

−1−92√8

1 answer

To find the solutions to the quadratic equation \( 4x^2 + 2x = 10 \), we first rearrange it into standard form:

\[ 4x^2 + 2x - 10 = 0 \]

Now we can apply the quadratic formula, which is given by:

\[ x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a} \]

Here, \( a = 4 \), \( b = 2 \), and \( c = -10 \).

Calculating the discriminant:

\[ b^2 - 4ac = 2^2 - 4(4)(-10) = 4 + 160 = 164 \]

Now we can substitute the values into the quadratic formula:

\[ x = \frac{-2 \pm \sqrt{164}}{2(4)} = \frac{-2 \pm \sqrt{164}}{8} \]

Since \( \sqrt{164} = \sqrt{4 \times 41} = 2\sqrt{41} \):

\[ x = \frac{-2 \pm 2\sqrt{41}}{8} = \frac{-2}{8} \pm \frac{2\sqrt{41}}{8} = \frac{-1 \pm \sqrt{41}}{4} \]

We can separate this into the two solutions:

\[ x_1 = \frac{-1 + \sqrt{41}}{4} \quad \text{and} \quad x_2 = \frac{-1 - \sqrt{41}}{4} \]

From the provided options, the correct solutions must match these two forms.

Thus, the solution \( \frac{-1 - \sqrt{41}}{4} \) matches one of the options:

  • Response: \( -1 - \frac{\sqrt{41}}{4} \)

Therefore, this response is a solution to the quadratic equation.

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