plz do (iii)no. and (iv)no.
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Step-by-step explanation:
5b²-3b²
(a-b)² Identity
(5b)²-2×5b²×(3b)²+3b²
25b²-90b⁴+9b²
34b²-90b⁴
2b²(17-45b²)
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