Question Details

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

I. 4x2+20x+25=0
II. 2y2+11y+15=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 B

If x ≥ y

Solution :

To solve the given quadratic equations and establish the relationship between x and y, we will solve both equations step-by-step.

The correct option is: If x ≥ y

Step 1: Solve Equation I for x

Equation I is given as:

4x2+20x+25=0

Notice that this is a perfect square trinomial, as 4x2=2x2, 25=52, and the middle term is 2×2x×5=20x.
Thus, we can rewrite the equation as:

2x+52=0

Taking the square root on both sides:

2x+5=0

2x=-5

x=-52=-2.5

Step 2: Solve Equation II for y

Equation II is given as:

2y2+11y+15=0

To solve this quadratic equation by splitting the middle term, we need two numbers whose product is 2×15=30 and whose sum is 11.
These numbers are 6 and 5.
Rewrite the middle term:

2y2+6y+5y+15=0

Factor by grouping:

2yy+3+5y+3=0

2y+5y+3=0

Setting each factor to zero:

2y+5=0y=-52=-2.5

y+3=0y=-3

Step 3: Compare the values of x and y

We have:
Values of x: -2.5
Values of y: -2.5,-3

Comparing each value:
1. When x=-2.5 and y=-2.5, x=y.
2. When x=-2.5 and y=-3, x>y (since -2.5 is greater than -3).

Combining both comparisons, we get:

xy

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