Mathematics
The sum of the squares of two consecutive integers is 41. The integers are :
4 and -5 or -4 and 5
4 and 5 or -4 and -5
3 and 4 or -4 and -3
6 and 3 or -6 and -3
Quadratic Equations
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Answer
Let two consecutive integers be x and x + 1.
Given,
Sum of squares of two consecutive integers = 41.
⇒ x2 + (x + 1)2 = 41
⇒ x2 + x2 + 1 + 2x = 41
⇒ 2x2 + 2x = 41 - 1
⇒ 2x2 + 2x = 40
⇒ 2(x2 + x) = 40
⇒ x2 + x =
⇒ x2 + x = 20
⇒ x2 + x - 20 = 0
⇒ x2 + 5x - 4x - 20 = 0
⇒ x(x + 5) - 4(x + 5) = 0
⇒ (x - 4)(x + 5) = 0
⇒ x - 4 = 0 or x + 5 = 0
⇒ x = 4 or x = -5
If x = 4,
⇒ x + 1 = 4 + 1 = 5.
If x = -5,
⇒ x + 1 = -5 + 1 = -4.
Numbers = 4 and 5 or -4 and -5.
Hence, Option 2 is the correct option.
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