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Question
Math
Posted 6 months ago

Solve the equation z2+4z+13=0z^{\wedge} 2+4 z+13=0, where zz is a complex number.
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Answer from Sia
Verified answer
Posted 6 months ago
Solution by Steps
step 1
To solve the quadratic equation z2+4z+13=0z^2 + 4z + 13 = 0 for zz, we use the quadratic formula z=b±b24ac2az = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}, where a=1a = 1, b=4b = 4, and c=13c = 13
step 2
Calculate the discriminant: b24ac=424113=1652=36b^2 - 4ac = 4^2 - 4 \cdot 1 \cdot 13 = 16 - 52 = -36
step 3
Since the discriminant is negative, the solutions will be complex numbers
step 4
Substitute the values into the quadratic formula: z=4±3621=4±6i2z = \frac{-4 \pm \sqrt{-36}}{2 \cdot 1} = \frac{-4 \pm 6i}{2}
step 5
Simplify the expression: z=42±6i2=2±3iz = \frac{-4}{2} \pm \frac{6i}{2} = -2 \pm 3i
Answer
The solutions to the equation z2+4z+13=0z^2 + 4z + 13 = 0 are z=2+3iz = -2 + 3i and z=23iz = -2 - 3i.
Key Concept
Solving quadratic equations with complex solutions
Explanation
When the discriminant of a quadratic equation is negative, the solutions are complex numbers. The quadratic formula can be used to find these solutions.

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