evaluate 69*71
step by step
Answers
Answered by
59
Answer:
69 x 71
(70-1) * (70+1)
using (a+b)( a - b)= a square + b square
=(70)square +(1)sqaure
=4900+1
=4901
Answered by
52
Answer:
With
Step-by-step explanation:
69*71= (70-1) (70+1).
Using the identity (a^2-b^2)=(a+b)(a-b)]
(70)^2-(1)^2
4900-1
4899
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