Question Details

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


I. 10x2+13x14=0
II. y2+5y+6=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 A

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 and compare their roots.

Step 1: Solve Equation I for x

The first equation is:
10x2+13x14=0
To solve this quadratic equation by splitting the middle term, we find two numbers whose product is 10×(14)=140 and whose sum is 13. These numbers are 20 and 7.
Splitting the middle term:
10x2+20x7x14=0
Factorizing by grouping:
10x(x+2)7(x+2)=0
(10x7)(x+2)=0
This gives the roots:
x=710=0.7 or x=2

Step 2: Solve Equation II for y

The second equation is:
y2+5y+6=0
We find two numbers whose product is 6 and whose sum is 5. These numbers are 2 and 3.
Splitting the middle term:
y2+2y+3y+6=0
Factorizing by grouping:
y(y+2)+3(y+2)=0
(y+2)(y+3)=0
This gives the roots:
y=2 or y=3

Step 3: Compare the values of x and y

Now, we compare each value of x with each value of y:
- Comparing x=0.7:
For y=2, 0.7>2 (so x>y).
For y=3, 0.7>3 (so x>y).
- Comparing x=2:
For y=2, 2=2 (so x=y).
For y=3, 2>3 (so x>y).
Combining all the cases, we find that x is either greater than or equal to y (xy).

Therefore, the correct relation is if x ≥ y.

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