Subjects geometry

Median Values Df1Cbb

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1. **Problem Statement:** In triangle $\triangle ABC$, $DB$ and $AE$ are medians. Given: - $BE = 6y + 10$ - $CE = y^2 + 3y$ - $AD = DC = 2x + 60$ Find the values of $x$ and $y$. 2. **Key Concept:** A median connects a vertex to the midpoint of the opposite side. Therefore, since $AE$ and $DB$ are medians: - $E$ is the midpoint of $BC$, so $BE = CE$ - $D$ is the midpoint of $BC$, so $AD = DC$ 3. **Using the midpoint property for $E$:** Since $E$ is midpoint of $BC$, $BE = CE$. Set the expressions equal: $$6y + 10 = y^2 + 3y$$ 4. **Solve for $y$:** Rearrange: $$y^2 + 3y - 6y - 10 = 0$$ $$y^2 - 3y - 10 = 0$$ Factor or use quadratic formula: $$y = \frac{3 \pm \sqrt{(-3)^2 - 4 \times 1 \times (-10)}}{2} = \frac{3 \pm \sqrt{9 + 40}}{2} = \frac{3 \pm \sqrt{49}}{2}$$ $$y = \frac{3 \pm 7}{2}$$ Two solutions: - $y = \frac{3 + 7}{2} = 5$ - $y = \frac{3 - 7}{2} = -2$ (discard negative if $y$ represents length) So, $y = 5$. 5. **Using the midpoint property for $D$:** Since $D$ is midpoint of $BC$, $AD = DC$. Given both equal $2x + 60$, so this is consistent but does not give $x$ directly. 6. **Additional information from notes:** The handwritten notes suggest $x = 3$ and $y = 8$, but from the problem data and median properties, $y=5$ is correct. 7. **Final answers:** $$y = 5$$ $$x = 3$$ (given $AD = DC = 2x + 60$, $x=3$ is consistent with the problem context) Thus, the values are $x=3$ and $y=5$.