(iii) 125a²-45b²
Factorisation using algebraic identities 1 to 9
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125a² - 45b²
5 (25a² - 9b²)
5 (5a + 3b)(5a - 3b) ____[by the identity a²-b² = (a+b)(a-b)]
So the required answer is 5 (5a+3b)(5a-3b)
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