Which of the following is a solution to the quadratic equation 2x2−5x=6? Assume that the solution has been rounded to the nearest hundredth, if applicable.(1 point)

Responses

x=0.89
x equals 0.89

x=−0.89
x equals negative 0.89

x=1.03
x equals 1.03

x=−1.03

1 answer

To solve the quadratic equation \( 2x^2 - 5x = 6 \), we first rearrange it to standard form:

\[ 2x^2 - 5x - 6 = 0 \]

Next, we can use the quadratic formula:

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

where \( a = 2 \), \( b = -5 \), and \( c = -6 \).

First, we calculate the discriminant \( b^2 - 4ac \):

\[ b^2 - 4ac = (-5)^2 - 4(2)(-6) = 25 + 48 = 73 \]

Now we can compute the roots:

\[ x = \frac{-(-5) \pm \sqrt{73}}{2(2)} = \frac{5 \pm \sqrt{73}}{4} \]

Calculating the two potential solutions:

  1. \( x_1 = \frac{5 + \sqrt{73}}{4} \)
  2. \( x_2 = \frac{5 - \sqrt{73}}{4} \)

Now we approximate \( \sqrt{73} \):

\[ \sqrt{73} \approx 8.544 \]

Calculating \( x_1 \):

\[ x_1 = \frac{5 + 8.544}{4} = \frac{13.544}{4} \approx 3.386 \]

Calculating \( x_2 \):

\[ x_2 = \frac{5 - 8.544}{4} = \frac{-3.544}{4} \approx -0.886 \]

Rounding \( x_2 \) to the nearest hundredth gives:

\[ x_2 \approx -0.89 \]

Thus, the solution to the quadratic equation \( 2x^2 - 5x = 6 \), rounded to the nearest hundredth, is:

\( x = -0.89 \)

So the correct response is:

x equals negative 0.89.