7 Evaluate the following by using suitable
indentity
a)
202 X205
b)99²
Answers
Answered by
1
Step-by-step explanation:
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Answered by
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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