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Fractorise (i) x ^(2) + 5x + 4 (ii) ...

Fractorise
(i) `x ^(2) + 5x + 4`
(ii) `9x ^(2) - 25`
(iii) `25 a ^(2) + 40 ab + 16 b^(2)`
(iv) ` 49x ^(2) -112 xy + 64 y ^(2)`

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