Question

Evalute the following using identities


d) 109²-98²​

Answer 1

Step-by-step explanation:

it's easy

see

we have to use identity

(100+9)² - (100-2)²

now just use identity of

(a+b)²=a²+b²+2ab

(a-b)²= a²+b²-2ab

now just put values and solve

Answer 2

Answer:

we can also use this easy method which is given below

Step-by-step explanation:

109²-98²

we have the identity

a²-b²=(109+98)×(109-98)

=207×11

=2277

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