Solve using
identity
(12.1)^2 -(7.9)^2
Answers
Answered by
2
Answer:
84
Step-by-step explanation:
a^2-b^2=(a+b)(a-b)
a+b=12.1+7.9=20
a-b=12.1-7.9=4.2
12.1^2-7.9^2=20×4.2=84
hope this helps
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