alleryThe identity (a − b)² is equal to:
Aa² − b²
Ba² − 2ab + b²
Ca² + 2ab + b²
Da² + ab − b²
Answer & Solution
Correct answer: B. a² − 2ab + b²
We have (a − b)² = (a − b)(a − b).
That is (a − b)² = a² − ab − ba + b².
So (a − b)² = a² − 2ab + b².
The middle term is negative, distinguishing this from (a + b)².
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