Solve the equation x^2−5x+10=0 . Write your conjugate pair solution(s) as two values separated by a ± sign.

1 answer

To solve the quadratic equation \( x^2 - 5x + 10 = 0 \), we can use the quadratic formula:

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

In this equation, the coefficients are:

  • \( a = 1 \)
  • \( b = -5 \)
  • \( c = 10 \)

Now, we can substitute these values into the quadratic formula.

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

\[ b^2 - 4ac = (-5)^2 - 4 \cdot 1 \cdot 10 = 25 - 40 = -15 \]

Since the discriminant is negative, the solutions will be complex. Now we can calculate the values of \( x \):

\[ x = \frac{-(-5) \pm \sqrt{-15}}{2 \cdot 1} = \frac{5 \pm \sqrt{-15}}{2} \]

We can express \( \sqrt{-15} \) as \( i\sqrt{15} \), where \( i \) is the imaginary unit. Thus, we have:

\[ x = \frac{5 \pm i\sqrt{15}}{2} \]

So the conjugate pair solutions can be written as:

\[ x = \frac{5}{2} \pm \frac{i\sqrt{15}}{2} \]

Therefore, the final solution is:

\[ \frac{5}{2} \pm \frac{i\sqrt{15}}{2} \]