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4-2.Quadratic Equations and Inequations
hard
સમીકરણ $\left|x^2-8 x+15\right|-2 x+7=0$ ના તમામ બીજનો સરવાળો $...........$ છે.
A
$9+\sqrt{3}$
B
$11+\sqrt{3}$
C
$9-\sqrt{3}$
D
$11-\sqrt{3}$
(JEE MAIN-2023)
Solution
For $x \leq 3$ or $x \geq 5$
$x^2-8 x+15-2 x+7=0$
$x=5+\sqrt{3}$
For $3 < x < 5, x^2-8 x+15+2 x-7=0$
$x =4$
Hence sum $=9+\sqrt{3}$
Standard 11
Mathematics