Question Details

Directions (42-46) : In each question two equations numbered (I) and (II) are given. You have to solve both the equations and mark appropriate answer.


x2-21x+108=0

y2-14y+48=0

Options

A

If x<y

B

If x>y

C

If x>=y

D

If x<=y

E

If x=y or no relation can be established

Show Answer

Correct Answer :

Option A

If x<y

Solution :

The correct option is If x>y.


Step 1: Solve Equation I for x

x2-21x+108=0

We split the middle term to factorize the equation. We find two factors of 108 whose sum is -21, which are -9 and -12:

x2-9x-12x+108=0

x(x-9)-12(x-9)=0

(x-9)(x-12)=0

Thus, the roots for x are:

x=9 or x=12


Step 2: Solve Equation II for y

y2-14y+48=0

We find two factors of 48 whose sum is -14, which are -6 and -8:

y2-6y-8y+48=0

y(y-6)-8(y-6)=0

(y-6)(y-8)=0

Thus, the roots for y are:

y=6 or y=8


Step 3: Compare the values of x and y

Comparing each value of x with every value of y:
- For x=9: 9>6 and 9>8
- For x=12: 12>6 and 12>8

In all cases, every root of x is strictly greater than every root of y.

Hence, the relation between x and y is x > y.

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