Question

4. While solving a problem, Samidha squared a number and then
subtracted 25 from it rather than the required, i.e. first subtracting 25
from the number and then squaring it. But she got the right answer.
What was the given number?
2
(A) 13
(B) 38
(C) 48
(D) None of these​

Answer 1

Answer:

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Answer 2

Answer:

13

Step-by-step explanation:

let the number be n

square of the number -> n²

subtracted 25 from it -> n²-25

actual requirement is (n-25)²  but she got the right answer

so..    n²-25 = (n-25)²

  =>   n²-25 = n²+(25)²-2(n)(25)

  =>   n²-25 = n²+625-50n

 =>    50 n = 625 +25

=>  50 n = 650

=>  n= 13