Djamila is looking for conjugate pair solutions to the equation 3x2−5x=−6 . Which of the following options should she choose?(1 point)

Responses

56±7i6
Start Fraction 5 over 6 End Fraction plus or minus Start Fraction 7 i over 6 End Fraction

56±i47√6
Start Fraction 5 over 6 End Fraction plus or minus Start Fraction i Start Root 47 End Root over 6 End Fraction

56±5i6
Start Fraction 5 over 6 End Fraction plus or minus Start Fraction 5 i over 6 End Fraction

−56±i47√6

1 answer

To find the conjugate pair solutions to the equation \(3x^2 - 5x = -6\), we first rewrite the equation in standard form:

\[ 3x^2 - 5x + 6 = 0. \]

Next, we can apply the quadratic formula, \(x = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}\), where \(a = 3\), \(b = -5\), and \(c = 6\).

Calculating the discriminant:

\[ b^2 - 4ac = (-5)^2 - 4(3)(6) = 25 - 72 = -47. \]

Since the discriminant is negative, the solutions will indeed be complex (conjugate pair solutions).

Now applying the quadratic formula:

\[ x = \frac{-(-5) \pm \sqrt{-47}}{2(3)} = \frac{5 \pm \sqrt{-47}}{6} = \frac{5 \pm i\sqrt{47}}{6}. \]

Thus the solutions are:

\[ x = \frac{5}{6} \pm \frac{\sqrt{47}}{6}i. \]

Among the provided options, this matches:

Start Fraction 5 over 6 End Fraction plus or minus Start Fraction i Start Root 47 End Root over 6 End Fraction.

So, Djamila should choose this option:

\[ \frac{5}{6} \pm \frac{i\sqrt{47}}{6}. \]