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3 and 4 .Determinants and Matrices
medium
निम्नलिखित समीकरणों का $a$ के कितने मानों के लिए कम से कम दो अलग-अलग हल $(Solution)$ है ?
$a x+y=0$,$x+(a+10) y=0$
A
$0$
B
$1$
C
$2$
D
Infinitely many
(KVPY-2017)
Solution
(c)
We have, $a x+y=0$
$x+(a+10) y=0$
From Eqs.$(i)$ and $(ii)$, we get
$\frac{a}{1}=\frac{1}{a+10} \Rightarrow a^2+10 a-1=0$
$a=\frac{-10 \pm \sqrt{104}}{2}$
$\therefore$ Two values of $a$ for systems has at least two distinct solution.
Standard 12
Mathematics