Factorise:
(1) 16x2 - 16x - 21
(2) 25x2 + 25x + 6
(3) 9x2 - 21xy + 10y2
(4) 49x2 - 35x + 6
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1
Answer:
1: (4x-7)(4x+3)
2:
Step-by-step explanation:
sorry for not complete answer
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