( a+ 2b)2 – (a – 2b)2 is equal to:
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e 8ab
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Understanding Tricks |
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Application We have to the value of (a+ 2b)2 – (a – 2b)2 = a2 + 4b2 + 4ab - a2 -4b2 + 4ab = 8ab |