using proper identity, factorise : (16a²/9)-(25b²/121)
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Step-by-step explanation:
16a²/9-25b²/121
(4a/3)²-(5b/11)²
(4a/3-5b/11)(4a/3+5b/11) [a²-b²= (a+b)( a-b)
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