Mathematics
Grade-8
Easy
Question
Which of the following is the difference between the squares of two consecutive natural numbers?
- Sum of the two numbers
- Difference of the numbers
- Twice the sum of the two numbers
- Twice the difference between the two numbers.
Hint:
1. Let the 2 consecutive natural numbers be x & x+1.
2. (a + b)2 = a2 + 2ab + b2
The correct answer is: Sum of the two numbers
TO FIND-
Difference between squares of 2 consecutive natural numbers.
SOLUTION-
Let the first natural number be x
∴ next consecutive natural number = x + 1
Now, we are given that-
(x + 1)2 - (x)2
= [x2 + (2 * x * 1) + 1] - x2
= x2 + 2x + 1 - x2
= 2x + 1
From the given options,
a. 2 [x + (x + 1)] = 2 (x + x + 1) = 2 (2x + 1) = 4x + 2
b. x + (x + 1) = x + x + 1 = 2x + 1
c. (x + 1) - (x) = x + 1 - x = 1
d. 2 [(x+1) - x] = 2 (x + 1 - x) = 2 * 1 = 2
From the above calculations , we observe that-
Difference between the squares of 2 consecutive numbers = Sum of 2 consecutive numers = 2x + 1
FINAL ANSWER-
Option 'b' i.e. 'Sum of the two numbers' is the correct answer to the given question.
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Mathematics
Guess the irrational numbers that lies between ![4 space and space square root of 21](data:image/png;base64,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)
Guess the irrational numbers that lies between ![4 space and space square root of 21](data:image/png;base64,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)
MathematicsGrade-8
Mathematics
What should come in place of both x in the equation
![fraction numerator x over denominator square root of 128 end fraction equals fraction numerator square root of 162 over denominator x end fraction](data:image/png;base64,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)
What should come in place of both x in the equation
![fraction numerator x over denominator square root of 128 end fraction equals fraction numerator square root of 162 over denominator x end fraction](data:image/png;base64,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)
MathematicsGrade-8