Question

12. a (a – 1) - b (b - 1)​

Answer 1

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$\huge{\orange{AnSwEr:-}}$

$a(a - 1) - b(b - 1) \\ = {a}^{2} - a - {b}^{2} + b \\ = {a}^{2} - {b}^{2} - a + b$

Answer 2

Answer:

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