Question Details

Directions (31-35): In each of the following questions two equations are given. Solve these equations and give answer:


I. x2 - 15x + 54 = 0
II. y2 - 23y + 132 = 0

Options

A

if x ≥ y

B

if x > y

C

if x ≤ y

D

if x < y

E

x = y or no relation can be established between x and y

Show Answer

Correct Answer :

Option D

if x < y

if x < y

Solution :

To find the relationship between x and y, we need to solve the two given quadratic equations separately.

Step 1: Solve Equation I for x
The first equation is:
x2 - 15 x + 54 = 0

To solve this by factorization, we look for two numbers that multiply to 54 and add up to -15. These numbers are -6 and -9.
Splitting the middle term, we get:
x2 - 9 x - 6 x + 54 = 0
x ( x - 9 ) - 6 ( x - 9 ) = 0
( x - 6 ) ( x - 9 ) = 0
So, the roots are:
x = 6 or x=9

Step 2: Solve Equation II for y
The second equation is:
y2 - 23 y + 132 = 0

We look for two numbers that multiply to 132 and add up to -23. These numbers are -11 and -12.
Splitting the middle term, we get:
y2 - 12 y - 11 y + 132 = 0
y ( y - 12 ) - 11 ( y - 12 ) = 0
( y - 11 ) ( y - 12 ) = 0
So, the roots are:
y = 11 or y=12

Step 3: Compare the values of x and y
Let's compare each value of x with the values of y:
- For x=6, both 6<11 and 6<12 are true, so x<y.
- For x=9, both 9<11 and 9<12 are true, so x<y.
Since all values of x are strictly less than all values of y, we conclude that x<y.

Therefore, the correct relation is if x < y.

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