(í) (x + 3) (x – 3) (x + 4) (x - 4)
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i hope it is right
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Answer:
(x2 - 9)(x2-16)
x2 (x2-16)-9(x2-16)
x4 - 16x2- 9x2+ 144
x4 - 25x2 + 144
Now u can solve it By middle term split
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