2. What are the roots of x2 - 4x - 5 = 0.A. (1,5)B.(-1,-5)C. (-1,5)D. (1,-5). Created by jannahgunn. Math

2. What are the roots of x2 - 4x - 5 = 0.A. (1,5)B.(-1,-5)C. (-1,5)D. (1,-5)...

Question: What are the roots of x² - 4x - 5 = 0.

Answer: $\Large\underline{\rm\green{\:C. \:(\text-1,5)\:}}$

Solution: Find the roots of the quadratic equation by using the quadratic formula.

$\begin{aligned}& \bold{ \color{lightblue}Formula:} \\& \boxed{x = \frac{ \text -b \pm \sqrt{ {b}^{2} - 4ac } }{2a} } \end{aligned}$

$\begin{aligned}{x = \frac{ \text -( \text - 4) \pm \sqrt{( \text - 4)^{2} - 4(1)( \text - 5)} }{2(1)} } \end{aligned}$

$\begin{aligned}{x = \frac{4 \pm \sqrt{16 - 4(1)( \text - 5)} }{2(1)} } \end{aligned}$

Root #1:

Root #2:

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