31
A positive number exceed its positive square root by 30. Find the number
- A16
- B36
- C25
- D49
Answer not set
Log in or create a free account to reply and vote.
0
CCommunity
Let the positive no. Be x2.
x2 - x = 30
⇒ x2 - x - 30 = 0
⇒ x2 - 6x + 5x - 30 = 0
⇒ (x - 6)(x + 5) = 0
⇒ x = 6, ? x is positive
∴ The no. is 62 = 36
x2 - x = 30
⇒ x2 - x - 30 = 0
⇒ x2 - 6x + 5x - 30 = 0
⇒ (x - 6)(x + 5) = 0
⇒ x = 6, ? x is positive
∴ The no. is 62 = 36
0
CCommunity
x-√x =30 If we put value of X with perfect square. Then we have x= 4,9,16,25,36,49,64,81..... Perfect value of x=36 , (36-√36)=36-6=30.