Question

4. Evaluate the following by using the identity (a - b) =a? - 2ab + b:

(6) (492)
​

Answer 1

Step-by-step explanation:

Using (a−b)

2

= a

2

−2ab+b

2

to calculate the value of (49)

2

We can write (49)

2

as (50−1)

2

(50−1)

2

=50

2

−2×50×1+1

2

= 2500−100+1

The answer is 2401

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