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3.
Factorise each of the following expressions
completely.
((a) a² + 9a +8
(b) b2 + 8b + 15
(c) c2 – 90 + 20
(d) - - 164 + 28
(e) f2 + 6f - 16
() h2 + 2h - 120
(g) k– 4k – 12
(h) m2 – 20m - 21
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