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Sagot :
To solve the quadratic equation [tex]\(2x^2 + 26 = 0\)[/tex], we will follow these steps:
1. Rewrite the equation in standard form:
The given equation is already in standard form [tex]\(ax^2 + bx + c = 0\)[/tex]:
[tex]\[2x^2 + 26 = 0.\][/tex]
2. Identify the coefficients [tex]\(a\)[/tex], [tex]\(b\)[/tex], and [tex]\(c\)[/tex]:
[tex]\[a = 2,\][/tex]
[tex]\[b = 0,\][/tex]
[tex]\[c = 26.\][/tex]
3. Calculate the discriminant [tex]\(\Delta\)[/tex]:
The discriminant [tex]\(\Delta\)[/tex] is given by:
[tex]\[\Delta = b^2 - 4ac.\][/tex]
Substituting the values of [tex]\(a\)[/tex], [tex]\(b\)[/tex], and [tex]\(c\)[/tex]:
[tex]\[\Delta = 0^2 - 4 \cdot 2 \cdot 26 = 0 - 208 = -208.\][/tex]
4. Analyze the discriminant:
The discriminant [tex]\(\Delta = -208\)[/tex] is negative, which indicates that the roots of the quadratic equation are complex numbers (non-real roots).
5. Use the quadratic formula:
The general formula to solve the quadratic equation [tex]\(ax^2 + bx + c = 0\)[/tex] is:
[tex]\[x = \frac{-b \pm \sqrt{\Delta}}{2a}.\][/tex]
Since [tex]\(\Delta = -208\)[/tex], let's substitute [tex]\(\Delta\)[/tex] and the values of [tex]\(a\)[/tex] and [tex]\(b\)[/tex]:
[tex]\[x = \frac{0 \pm \sqrt{-208}}{2 \cdot 2} = \frac{\pm \sqrt{-208}}{4}.\][/tex]
6. Simplify the root:
We know that [tex]\(\sqrt{-208} = \sqrt{-1 \cdot 208} = i \sqrt{208},\)[/tex]
where [tex]\(i\)[/tex] is the imaginary unit ([tex]\(i = \sqrt{-1}\)[/tex]).
Therefore:
[tex]\[x = \frac{\pm i \sqrt{208}}{4}.\][/tex]
7. Simplify further:
We can simplify [tex]\(\sqrt{208}\)[/tex]:
[tex]\[208 = 16 \times 13 \implies \sqrt{208} = \sqrt{16 \times 13} = 4\sqrt{13}.\][/tex]
Thus:
[tex]\[x = \frac{\pm i \cdot 4 \sqrt{13}}{4} = \pm i \sqrt{13}.\][/tex]
Therefore, the roots of the equation [tex]\(2x^2 + 26 = 0\)[/tex] are:
[tex]\[x = -i \sqrt{13} \quad \text{and} \quad x = i \sqrt{13}.\][/tex]
So, the correct answer is:
[tex]\[x = -i \sqrt{13}, \quad x = i \sqrt{13}.\][/tex]
1. Rewrite the equation in standard form:
The given equation is already in standard form [tex]\(ax^2 + bx + c = 0\)[/tex]:
[tex]\[2x^2 + 26 = 0.\][/tex]
2. Identify the coefficients [tex]\(a\)[/tex], [tex]\(b\)[/tex], and [tex]\(c\)[/tex]:
[tex]\[a = 2,\][/tex]
[tex]\[b = 0,\][/tex]
[tex]\[c = 26.\][/tex]
3. Calculate the discriminant [tex]\(\Delta\)[/tex]:
The discriminant [tex]\(\Delta\)[/tex] is given by:
[tex]\[\Delta = b^2 - 4ac.\][/tex]
Substituting the values of [tex]\(a\)[/tex], [tex]\(b\)[/tex], and [tex]\(c\)[/tex]:
[tex]\[\Delta = 0^2 - 4 \cdot 2 \cdot 26 = 0 - 208 = -208.\][/tex]
4. Analyze the discriminant:
The discriminant [tex]\(\Delta = -208\)[/tex] is negative, which indicates that the roots of the quadratic equation are complex numbers (non-real roots).
5. Use the quadratic formula:
The general formula to solve the quadratic equation [tex]\(ax^2 + bx + c = 0\)[/tex] is:
[tex]\[x = \frac{-b \pm \sqrt{\Delta}}{2a}.\][/tex]
Since [tex]\(\Delta = -208\)[/tex], let's substitute [tex]\(\Delta\)[/tex] and the values of [tex]\(a\)[/tex] and [tex]\(b\)[/tex]:
[tex]\[x = \frac{0 \pm \sqrt{-208}}{2 \cdot 2} = \frac{\pm \sqrt{-208}}{4}.\][/tex]
6. Simplify the root:
We know that [tex]\(\sqrt{-208} = \sqrt{-1 \cdot 208} = i \sqrt{208},\)[/tex]
where [tex]\(i\)[/tex] is the imaginary unit ([tex]\(i = \sqrt{-1}\)[/tex]).
Therefore:
[tex]\[x = \frac{\pm i \sqrt{208}}{4}.\][/tex]
7. Simplify further:
We can simplify [tex]\(\sqrt{208}\)[/tex]:
[tex]\[208 = 16 \times 13 \implies \sqrt{208} = \sqrt{16 \times 13} = 4\sqrt{13}.\][/tex]
Thus:
[tex]\[x = \frac{\pm i \cdot 4 \sqrt{13}}{4} = \pm i \sqrt{13}.\][/tex]
Therefore, the roots of the equation [tex]\(2x^2 + 26 = 0\)[/tex] are:
[tex]\[x = -i \sqrt{13} \quad \text{and} \quad x = i \sqrt{13}.\][/tex]
So, the correct answer is:
[tex]\[x = -i \sqrt{13}, \quad x = i \sqrt{13}.\][/tex]
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