Answer:

(a-b)² = a2 - 2ab + b2

(a+b)² = a2 + 2ab + b2

(a+b)² - (a-b)² = a2 +2ab + b2 - a2 +2ab + b2 = 4ab.

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Answer:

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Step-by-step explanation:

a + b)2 – 4ab = a2 + b2 + 2ab – 4ab. = a2 + b2 – 2ab. = (a – b)2. Concept: Expansion of (a + b)2 = a2 + 2ab