find the square root of 42 by using identities identities
Answers
Answered by
1
Answer: 1764
Step-by-step explanation: (40+2)²
(a+b)²= a²+2ab+b²
(40+2)²
= 40²+ 2*40*2 + 2²
= 1600+ 160+ 4
= 1764
Answered by
1
Answer:
Consider the given number.
42
we know that
(a+b) ² =a ² +b ²+2ab
Therefore,
(40+2) ²=(40) ²+2 ² +2×40×2
(42) ² =1600+4+160
(42) ²=1764
Hence, this is the answer.
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