Quadratic Equations

Quantitative Aptitude ( CCS)

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I. 2x²-31x= -120

II. 8y²-74y=-143

x > y

x ≥ y

x < y

x ≤ y

Explanation:

2x²-31x= -120
2x² -16x-15x+120=0
2x(x -8) -15(x -8)=0
(x-8) ( 2x-15)=0
x= 8 , 15/2
8y²-74y=-143
8y² -22y-52y+143 =
2y( 4y-11) -13(4y-11)=0
(4y-11) ( 2y-13)=0
y= 11/4, 13/2
Hence x>y

By: Amit Kumar

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