If the slope of one of the lines in the pair | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(A) Given the equation of the pair of lines is $8x^2 + axy + y^2 = 0$. Let the slopes of the two lines be $m_1$ and $m_2$. For a homogeneous equation

Vedclass · Accepted Answer

$8 \sqrt{\frac{2}{3}}$

Vedclass · Answer

(A) Given the equation of the pair of lines is $8x^2 + axy + y^2 = 0$. Let the slopes of the two lines be $m_1$ and $m_2$. For a homogeneous equation $Ax^2 + Bxy + Cy^2 = 0$,the sum of slopes is $m_1 + m_2 = -\frac{B}{C}$ and the product of slopes is $m_1 m_2 = \frac{A}{C}$. Here,$A = 8$,$B = a$,and $C = 1$. So,$m_1 + m_2 = -a$ and $m_1 m_2 = 8$. Given that one slope is thrice the other,let $m_1 = 3m_2$. Substituting this into the product equation: $(3m_2) 	imes m_2 = 8$ $\Rightarrow 3m_2^2 = 8$ $\Rightarrow m_2^2 = \frac{8}{3}$ $\Rightarrow m_2 = \pm \sqrt{\frac{8}{3}}$. Substituting into the sum equation: $3m_2 + m_2 = -a$ $\Rightarrow 4m_2 = -a$ $\Rightarrow a = -4m_2$. Thus,$a = -4 \left( \pm \sqrt{\frac{8}{3}} ight) = \pm 4 	imes 2 \sqrt{\frac{2}{3}} = \pm 8 \sqrt{\frac{2}{3}}$. Considering the positive value,$a = 8 \sqrt{\frac{2}{3}}$.

If the slope of one of the lines in the pair of lines $8x^2 + axy + y^2 = 0$ is thrice the slope of the other line,then $a =$

Similar Questions

If the sum of any two roots of the equation $x^3+p x^2+q x+r=0$ is zero,then

Who first discovered protoplast fusion?

The pioneer country in the production of fuel-alcohol is

In the expansion of $(1+x)^n$,the coefficients of $p$-th and $(p+1)$-th terms are respectively $p$ and $q$. Then $p+q=$

In the $Al_{2}Cl_{6}$ dimer,which of the following statements is true regarding the $Al-Cl$ bonds?

Vedclass Test Series

Exam Paper Generator

Online Exam Module