Question

The value of 249 x249 -248x248
(a)1
(b)249
(c)49.7
(d)248​

Answer 1

Answer:

497

Step-by-step explanation:

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Answer 2

Ans:(c) 49.7

Step-by-step explanation:

The value is (249)^2-(248)^2=497(249)

2

−(248)

2

=497

Step-by-step explanation:

To find : The value of 249 square minus 248 square by using identity ?

Solution :

The expression is (249)^2-(248)^2(249)

2

−(248)

2

Using algebraic identity, a^2-b^2=(a+b)(a-b)a

2

−b

2

=(a+b)(a−b)

Here, a=249 and b=248

(249)^2-(248)^2=(249+248)(249-248)(249)

2

−(248)

2

=(249+248)(249−248)

(249)^2-(248)^2=(497)(1)(249)

2

−(248)

2

=(497)(1)

(249)^2-(248)^2=497(249)

2

−(248)

2

=497

Therefore, the value is (249)^2-(248)^2=497(249)

2

−(248)

2

=497

51 square - 49 square identity