2.
Let's resolve into factors
(iii) (p^2 - 3q^2)^2 – 16(p^2 – 3q^2) +63
(v) x²y^2 +23xy - 420
(i) (a + b)^2 – 5a – 5b +6
(vii) a^2 + ab - 12b^2
(ix) a^6 + 3a^3b^3 – 40b^6
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