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1. If x>y>0, x^2+y^2=13 and xy=6, then y=? 2. Solve by factorrization method 4x^2-4ax+(a^2-b^2)=0 (a,b,E R). 3. If the price of a book is reduced by Rs. 5 a person can buy 5 more books for Rs. 300. Find the original price of the book? 4. A 2-digit number is four times the sum and the three times the product of its digit. Find the number? 5. The sum of the squares of two consecutive odd number is 394. Find the numbers?

1. If x>y>0, x^2+y^2=13 and xy=6, then y=?


2. Solve by factorrization method 4x^2-4ax+(a^2-b^2)=0 (a,b,E R).


3. If the price of a book is reduced by Rs. 5 a person can buy    5 more books for Rs. 300. Find the original price of the book?


4. A 2-digit number is four times the sum and the three times the product of its digit. Find the number?


5. The sum of the squares of two consecutive odd number is 394. Find the numbers?

Grade:10

2 Answers

Devesh Lall
35 Points
9 years ago

SOLUTION FOR QUESTION NO.-1

Since it is given that x>y>0 & 2x=2y=13

=>2(x+y)=13

=>x+y=13/2-(1)

Since it is also given that xy=6 =>y=x/6

putting the value of y in (1):-

x+6/x=13/2

2xsq+12=13x

2xsq-13x+12=0

x=13+_under root(73)

   -----------------------   >0

           4

now, putting the value of y in (2) we get:-

y=24

   ---------------------       >0

    13+_under root(73)

Devesh Lall
35 Points
9 years ago

SOLUTION FOR QUESTION NO.-5

Let 1 odd no. be x & its consequtive be (x+2)

since sum of their squares=394

Therefore, 

      A/Q :-

xsq. + (x+2)sq.=394

xsq.+xsq.+4+4x=394

2xsq.+4x-390=0

xsq.+2x-195=0

On using the quadratic formula, we get:-

x=-2+_under root(784)

   ______________________

           2

 =28-2  or  -28-2

   ____       _______

    2             2

= 13    or   -15

Therefore now

the req. 2 nos are:-

13 & (13+2)  or  -15 & (-15+2)

13 and 15     or  -15 and -13

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