Question Details

Directions (41-45):In each of these questions, two equations (I) and (II) are given. Solve the equations and mark the correct option.



I. x2 + 21x + 108 = 0
II. y2 + 14y + 45 = 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 between x and y

Show Answer

Correct Answer :

Option D

If x ≤ y

Solution :

The correct option is If x ≤ y.


Step 1: Solve Equation I for x

x2+21x+108=0

To factorize this quadratic equation, we split the middle term into two numbers whose sum is 21 and product is 108.
The suitable numbers are 12 and 9.

x2+12x+9x+108=0

x(x+12)+9(x+12)=0

(x+12)(x+9)=0

Equating each factor to zero gives:

x=-12 or x=-9


Step 2: Solve Equation II for y

y2+14y+45=0

Similarly, we split the middle term into two numbers whose sum is 14 and product is 45.
The suitable numbers are 9 and 5.

y2+9y+5y+45=0

y(y+9)+5(y+9)=0

(y+9)(y+5)=0

Equating each factor to zero gives:

y=-9 or y=-5


Step 3: Compare the values of x and y

Let's compare every value of x with every value of y:

1. For x=-12:

-12<-9 ⇒ x<y

-12<-5 ⇒ x<y

2. For x=-9:

-9=-9 ⇒ x=y

-9<-5 ⇒ x<y


In all cases, x is either less than or equal to y (xy).

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