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Answer :
To find the quadratic equation with the roots [tex]\(-8 + 5i\)[/tex] and [tex]\(-8 - 5i\)[/tex], we can use the fact that if a quadratic equation has roots [tex]\(a\)[/tex] and [tex]\(b\)[/tex], it can be expressed in the form:
[tex]\[
(x - a)(x - b) = 0
\][/tex]
Given the roots [tex]\(-8 + 5i\)[/tex] and [tex]\(-8 - 5i\)[/tex], let's substitute them into this form:
1. Substitute the roots into the factors:
[tex]\[
(x - (-8 + 5i))(x - (-8 - 5i)) = 0
\][/tex]
2. Simplify each term inside the parentheses:
[tex]\[
(x + 8 - 5i)(x + 8 + 5i) = 0
\][/tex]
3. Use the identity [tex]\((a + bi)(a - bi) = a^2 + b^2\)[/tex] to simplify the expression. Notice that this forms a difference of squares:
[tex]\[
(x + 8)^2 - (5i)^2
\][/tex]
4. Simplify each part:
- [tex]\((x + 8)^2 = x^2 + 16x + 64\)[/tex]
- [tex]\((5i)^2 = 25i^2 = -25\)[/tex] (since [tex]\(i^2 = -1\)[/tex])
5. Substitute back to get the quadratic expression:
[tex]\[
(x^2 + 16x + 64) - (-25) = x^2 + 16x + 64 + 25
\][/tex]
6. Combine the constant terms:
[tex]\[
x^2 + 16x + 89
\][/tex]
Therefore, the quadratic equation with the given roots is:
[tex]\[
x^2 + 16x + 89 = 0
\][/tex]
[tex]\[
(x - a)(x - b) = 0
\][/tex]
Given the roots [tex]\(-8 + 5i\)[/tex] and [tex]\(-8 - 5i\)[/tex], let's substitute them into this form:
1. Substitute the roots into the factors:
[tex]\[
(x - (-8 + 5i))(x - (-8 - 5i)) = 0
\][/tex]
2. Simplify each term inside the parentheses:
[tex]\[
(x + 8 - 5i)(x + 8 + 5i) = 0
\][/tex]
3. Use the identity [tex]\((a + bi)(a - bi) = a^2 + b^2\)[/tex] to simplify the expression. Notice that this forms a difference of squares:
[tex]\[
(x + 8)^2 - (5i)^2
\][/tex]
4. Simplify each part:
- [tex]\((x + 8)^2 = x^2 + 16x + 64\)[/tex]
- [tex]\((5i)^2 = 25i^2 = -25\)[/tex] (since [tex]\(i^2 = -1\)[/tex])
5. Substitute back to get the quadratic expression:
[tex]\[
(x^2 + 16x + 64) - (-25) = x^2 + 16x + 64 + 25
\][/tex]
6. Combine the constant terms:
[tex]\[
x^2 + 16x + 89
\][/tex]
Therefore, the quadratic equation with the given roots is:
[tex]\[
x^2 + 16x + 89 = 0
\][/tex]
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