Question

Evaluate (a+b)-(a-b)



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Answer 1

Answer:

(i) (a + b) (a – b)

= a (a – b) + b (a – b)

= a2 – ab + ab – b2 = a2 – b2

Answer 2

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

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