use identities to compute this
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Answer:
10609
9801
39984
2800
Step-by-step explanation:
(a) 103² = (100+3)²
= (a+b) ² = a²+b²+2ab
= 100²+3²+2×100×3
10000+9+600
10609
(b) 99²
(100-1)²
(a-b) ² = a²+b²-2ab
10000+1-200
= 9801
(c) 204×196
(a+b)(a-b) = a²-b²
(200+4)(200-4)
= 40000-16
= 39984
(d) 64²-36²
(a+b)(a-b)=a²-b²
=(64+36)(64-36)
=(100)(28)
=2800
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