hich answer shows the conjugate pair solutions to the equation x2−3x+8=−2?(1 point)

Responses

32±i23√2
Start Fraction 3 over 2 End Fraction plus or minus Start Fraction i Start Root 23 End Root over 2 End Fraction

32±i15√2
Start Fraction 3 over 2 End Fraction plus or minus Start Fraction i Start Root 15 End Root over 2 End Fraction

32±i31√2
Start Fraction 3 over 2 End Fraction plus or minus Start Fraction i Start Root 31 End Root over 2 End Fraction

−32±i31√2
negative Start Fraction 3 over 2 End Fraction plus or minus Start Fraction i Start Root 31 End Root over 2 End Fraction

1 answer

To solve the equation \( x^2 - 3x + 8 = -2 \), we start by rewriting it in standard form:

\[ x^2 - 3x + 10 = 0 \]

Next, we can use the quadratic formula to find the solutions, which is given by:

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

In our equation, \( a = 1 \), \( b = -3 \), and \( c = 10 \). Now we compute the discriminant:

\[ b^2 - 4ac = (-3)^2 - 4(1)(10) = 9 - 40 = -31 \]

Since the discriminant is negative (\(-31\)), this means the solutions will be complex.

Now we substitute the values into the quadratic formula:

\[ x = \frac{-(-3) \pm \sqrt{-31}}{2(1)} = \frac{3 \pm i\sqrt{31}}{2} \]

This can be expressed as:

\[ x = \frac{3}{2} \pm \frac{i\sqrt{31}}{2} \]

Thus, the conjugate pair solutions to the equation are:

\[ \frac{3}{2} \pm \frac{i\sqrt{31}}{2} \]

From the provided responses, the correct answer is:

\[ \text{Start Fraction 3 over 2 End Fraction plus or minus Start Fraction i Start Root 31 End Root over 2 End Fraction} \]