Math, asked by yadagirikummari, 8 months ago

7 Evaluate the following by using suitable
indentity
a)
202 X205
b)99²​

Answers

Answered by siddhantsinghbeast17
1

Step-by-step explanation:

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Answered by vpkarle1
2

Answer:

a)(200+2) (200+5). using (x+a) (x+b)

= x square+(a+b)x+ab

Therefore x= 200, a=2 and b= 5

therefore 200^2 + (2+5)200+2x5

therefore 40000+1400+10

therefore = 414100.

b) (100-1). using identity (a-b)^2

therefore a^2-2ab+b^2

thus a=100 and b=1

thus (100)^2-2x100x1+(1)^2

= 10000-200+1

= 9800+1

=9801

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