Quadratic Equations

Quantitative Aptitude (RRB NTPC)

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I. 10x²+9x+2=0

II. 6y²– 27y-15=0

x > y

x ≥ y

Can't be determine

x ≤ y

Explanation:

10x²+9x+2=0
10x² + 5x+ 4x+2=0
5x(2x +1) + 2(2x +1)=0
(2x+1) ( 5x+2)=0
x= -1/2 , -2/5= -0.5,-0.4
6y²– 27y-15=0
6y² -30y+ 3y -15=0
6y( y-5) + 3(y-5)=0
(y-5) ( 6y+3)=0
y= 5, -3/6 =5,-0.5

x y
-0.5 < 5
-0.5 = -0.5
-0.4 > 5
-0.4 > -0.5

So relation between x and y can't be determine

By: Amit Kumar

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