Question Details

In each of these questions, two equations (I) and (II) are given. You have to solve both the equations and give answers.

I.  x 2 7 x 60 = 0
II.  y 2 + 13 y + 40 = 0

Options

A

x ≥ y

B

x ≤ y

C

x > y

D

x < y

Show Answer

Correct Answer :

Option A

x ≥ y

x ≥ y

Solution :

To find the relationship between x and y, we solve the two quadratic equations step-by-step.

Step 1: Solve Equation I for x

The first equation is:

x2 - 7 x - 60 = 0

To factorize this quadratic equation, we find two numbers that multiply to -60 and add up to -7. These numbers are -12 and 5. Thus, we can write the equation as:

( x - 12 ) ( x + 5 ) = 0

Solving for x, we get:

x = 12 or x = - 5

Step 2: Solve Equation II for y

The second equation is:

y2 + 13 y + 40 = 0

To factorize this quadratic equation, we find two numbers that multiply to 40 and add up to 13. These numbers are 8 and 5. Thus, we can write the equation as:

( y + 8 ) ( y + 5 ) = 0

Solving for y, we get:

y = - 8 or y = - 5

Step 3: Compare the values of x and y

Let us compare each value of x with the values of y:
- For x=12, since 12 is greater than both -8 and -5, we have x>y.
- For x=-5:
Comparing with y=-8, we have -5>-8, so x>y.
Comparing with y=-5, we have -5=-5, so x=y.

Combining these findings, we establish that x is always greater than or equal to y.

Therefore, the correct relation is xy.

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