Equations And Inequations Ques 84
I. $4 x^{2}+5 x+1=0$
II. $2 y^{2}+7 y+6=0$
Directions : In the following questions two equations numbered I and II are given. You have to solve both the equations and give answer
(1) if $x>y$
(2) if $x \geq y$
(3) if $x<y$
(4) if $x \leq y$
(5) if $x=y$ or the relationship between $x$ and $y$ cannot be established.
Show Answer
Correct Answer: 84.(1)
Solution: (1) I. $4 x^{2}+5 x+1=0$
$\Rightarrow 4 x^{2}+4 x+x+1=0$
$\Rightarrow 4 x(x+1)+1(x+1)=0$
$\Rightarrow(x+1)(4 x+1)=0$
$\Rightarrow x=-1$ or, $-\frac{1}{4}$
II. $2 y^{2}+7 y+6=0$
$\Rightarrow 2 y^{2}+4 y+3 y+6=0$
$\Rightarrow 2 y(y+2)+3(y+2)=0$
$\Rightarrow(y+2)(2 y+3)=0$
$\Rightarrow y=-2$ or, $\frac{-3}{2}$
Clearly, $x>y$
BETA
