Answer:
1596
Step-by-step explanation:
38=40-2
42=40+2
38×42= (40-2)(40+2) { (a-b)(a+b) }=a²-b²
=40²-2²
= 1600-4=1596
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Answers & Comments
Answer:
1596
Step-by-step explanation:
38=40-2
42=40+2
38×42= (40-2)(40+2) { (a-b)(a+b) }=a²-b²
=40²-2²
= 1600-4=1596