Question

how to solve (198)square using identities

Answer 1

Step-by-step explanation:

Using (a−b)

2

= a

2

−2ab+b

2

to evaluate (198)

2

Writing (198)

2

as (200−2)

2

⇒ (200−2)

2

= 200

2

−2×200×2+2

2

= 40000−800+4

Hence the answer is 39204

Answer 2

Answer:

198×198=39204

Identity is not applicable for a single unit

For identities you must have at least 2 number