factorise
4a²+b^2-9c²-4ab+ 30cd-25d²
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1
Step-by-step explanation:
4a²+b²-4ab+2b-4a+1
= [(2a)²+b²-2×2a×b]+2(b-2a)+1
= (2a-b)²+2(b-2a)+1
= (2a-b)²-2×(2a-b)×1+1²
= (2a-b-1)²
= (2a-b-1)(2a-b-1)
Therefore,
Option (D) is co
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