Question Details

Determine the relationship between the two variables by solving the given quadratic equations (I) and (II).

I. x2 - 17x + 70 = 0

II. y2 - 14y + 48 = 0

Options

A

If x>y

B

If xy

C

If x=y or no relationship can be established between x and y

D

If xy

E

If x<y

Show Answer

Correct Answer :

Option C

If x=y or no relationship can be established between x and y

Solution :

The correct answer is: If x=y or no relationship can be established between x and y.

Step 1: Solve Equation (I) for x

The first quadratic equation is:

x2-17x+70=0

To factorize this equation, we find two numbers that multiply to give 70 and add up to -17. These factors are -10 and -7.
Rewriting the middle term:

x2-10x-7x+70=0

x(x-10)-7(x-10)=0

(x-10)(x-7)=0

Setting each factor to zero gives:

x=10 or x=7

Step 2: Solve Equation (II) for y

The second quadratic equation is:

y2-14y+48=0

To factorize this equation, we find two numbers that multiply to give 48 and add up to -14. These factors are -8 and -6.
Rewriting the middle term:

y2-8y-6y+48=0

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

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

Setting each factor to zero gives:

y=8 or y=6

Step 3: Compare the values of x and y

Now we compare every root of x with every root of y:

1. When x=10 and y=8, x>y.
2. When x=10 and y=6, x>y.
3. When x=7 and y=8, x<y.
4. When x=7 and y=6, x>y.

Because x can be greater than y in some cases and less than y in others, no definite relationship can be established between x and y.

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