Solve the quadratic equation 6x2−3x+6=0 . Which of the following expresses its solutions in the form a±bi ?(1 point)

Responses

14±15√4i
Start Fraction 1 over 4 End Fraction plus or minus Start Fraction Start Root 15 End Root over 4 End Fraction i

12±15√2i
Start Fraction 1 over 2 End Fraction plus or minus Start Fraction Start Root 15 End Root over 2 End Fraction i

14±17√4i
Start Fraction 1 over 4 End Fraction plus or minus Start Fraction Start Root 17 End Root over 4 End Fraction i

−14±15√4i

1 answer

To solve the quadratic equation \(6x^2 - 3x + 6 = 0\), we can use the quadratic formula:

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

where \(a = 6\), \(b = -3\), and \(c = 6\).

First, we need to calculate the discriminant:

\[ b^2 - 4ac = (-3)^2 - 4(6)(6) = 9 - 144 = -135 \]

Since the discriminant is negative, the solutions will be complex. Proceeding with the quadratic formula:

\[ x = \frac{-(-3) \pm \sqrt{-135}}{2(6)} = \frac{3 \pm \sqrt{135}i}{12} \]

Next, we simplify \(\sqrt{135}\):

\[ \sqrt{135} = \sqrt{9 \cdot 15} = 3\sqrt{15} \]

Substituting this back into the equation:

\[ x = \frac{3 \pm 3\sqrt{15}i}{12} \]

We can simplify this:

\[ x = \frac{3}{12} \pm \frac{3\sqrt{15}}{12}i = \frac{1}{4} \pm \frac{\sqrt{15}}{4}i \]

Thus, the solutions are:

\[ \frac{1}{4} \pm \frac{\sqrt{15}}{4}i \]

Now, let's match this with the provided options:

The correct option is:

Start Fraction 1 over 4 End Fraction plus or minus Start Fraction Start Root 15 End Root over 4 End Fraction i