4. Factorise the following by using the
identities or regrouping the terms.
a) 2x2 – 32x + 128 b) 3x2 + 18x + 27
c) 12x3y2 + 24x?y2 d) 36x3y22 +48x2y32
e) x2 + 7x + 12 f) 8r3 – 343
g) x2 – 2xy + y2 – x+y
h) x4 + 22x3 + 121x?'
i) a2 + b2 – 2(ab – ac + bc)
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