1. **Problem:** Given that one root of the quadratic equation $x^2 + x + 5 = 0$ is $-5$, determine which of the following statements is NOT true:
1) The other root is $-5$
2) The sum of the roots is $0$
3) The discriminant of the quadratic is greater than $0$
4) The product of the roots is greater than $0$
2. **Recall the quadratic root properties:**
For a quadratic equation $ax^2 + bx + c = 0$, the sum of roots $\alpha + \beta = -\frac{b}{a}$ and the product of roots $\alpha \beta = \frac{c}{a}$.
3. **Apply to the given equation:**
Here, $a=1$, $b=1$, $c=5$.
Sum of roots $= -\frac{1}{1} = -1$.
Product of roots $= \frac{5}{1} = 5$.
4. **Check the given root $-5$:**
If one root is $-5$, then the other root $r$ satisfies:
Sum: $-5 + r = -1 \implies r = 4$.
5. **Check each statement:**
1) Other root is $-5$? No, it is $4$.
2) Sum of roots is $0$? No, sum is $-1$.
3) Discriminant $\Delta = b^2 - 4ac = 1 - 20 = -19 < 0$, so discriminant is NOT greater than $0$.
4) Product of roots is $5 > 0$, true.
6. **Conclusion:**
Statements 1, 2, and 3 are false, but the question asks which is NOT true. The discriminant is less than zero, so statement 3 is false.
**Final answer:** The statement that is NOT true is **3) The discriminant of the quadratic is greater than 0**.
Quadratic Roots A90A70
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