9. Evaluate : (1) 103 x 97 (3) 77 x 83 (2) 205 x 195 (4) 153 x 147
Answers 2
Answer
1) 103×97= 9,991
2) 77×83= 6,391
3) 205×195= 39,975
4) 153×147= 22,491
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leocadialens
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Answer:
Step-by-step explanation:
1) 103×97
(100+3)×(100-3)
(a+b)(a-b) = a²-b²
=100²-3²
=10000-9=9991
2) 77×83
(80-3)×(80+3)
(a+b)-(a-b) = a²-b²
= 80²-3²
= 6400-9
= 6391
3) 205×195
(200+5)×(200-5)
(a+b)-(a-b) = a²-b²
= 200²-5²
= 40000-25
= 39975
4) 153×147
(150+3)×(150-3)
(a+b)(a-b) = a²-b²
= 150²-3²
= 22500-9
= 22491
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