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What are the solutions of this quadratic equation?

[tex]\[ x^2 - 10x = -34 \][/tex]

A. [tex]\( x = -8, -2 \)[/tex]
B. [tex]\( x = 5 \pm 3i \)[/tex]
C. [tex]\( x = -5 \pm 3i \)[/tex]
D. [tex]\( x = -5 \pm \sqrt{59} \)[/tex]


Sagot :

Let's solve the quadratic equation step-by-step.
The given equation is:

[tex]\[ x^2 - 10x = -34 \][/tex]

First, we rewrite the equation in standard quadratic form [tex]\( ax^2 + bx + c = 0 \)[/tex]:

[tex]\[ x^2 - 10x + 34 = 0 \][/tex]

Now, we use the quadratic formula to solve for [tex]\( x \)[/tex]:

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

For our equation [tex]\( x^2 - 10x + 34 = 0 \)[/tex], the coefficients are:
- [tex]\(a = 1\)[/tex]
- [tex]\(b = -10\)[/tex]
- [tex]\(c = 34\)[/tex]

Substituting these values into the quadratic formula, we get:

[tex]\[ x = \frac{-(-10) \pm \sqrt{(-10)^2 - 4 \cdot 1 \cdot 34}}{2 \cdot 1} \][/tex]

Simplifying inside the square root:

[tex]\[ x = \frac{10 \pm \sqrt{100 - 136}}{2} \][/tex]
[tex]\[ x = \frac{10 \pm \sqrt{-36}}{2} \][/tex]
[tex]\[ x = \frac{10 \pm 6i}{2} \][/tex]

Now, simplifying the fractions:

[tex]\[ x = 5 \pm 3i \][/tex]

Thus, the solutions to the quadratic equation [tex]\(x^2 - 10x = -34\)[/tex] are:

[tex]\[ x = 5 + 3i \quad \text{and} \quad x = 5 - 3i \][/tex]

The correct answer is:

B. [tex]\( x = 5 \pm 3i \)[/tex]