4aba−b
−4aba2−b2
−4aba−2−b
4aba−2−b−2
Correct answer is B
a−ba+b - a+ba−b = (a−b)2(a+b) - (a+b)2(a−b0
applying the principle of difference of two sqrt. Numerator = (a - b) + (a + b) (a - b) - (a + b)
= (a = b + a = b)(a = b - a = b)
2a(-2b) = -4ab
= −4ab(a+b)(a−b)
= −4aba2−b2
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