Factorisation
p^2+p-(a+1)(a+2)
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p^2 + p - (a + 1)*(a + 2)
= p^2 + [(a + 2) - (a - 1)]p - (a + 1)*(a + 2)
= p^2 + (a + 2)p - (a - 1)p - (a + 1)*(a + 2)
= p[p + (a + 2)] - (a - 1)[p + (a + 2)]
= [p + (a + 2)] * [p - (a - 1)] ——> Answer
= p^2 + [(a + 2) - (a - 1)]p - (a + 1)*(a + 2)
= p^2 + (a + 2)p - (a - 1)p - (a + 1)*(a + 2)
= p[p + (a + 2)] - (a - 1)[p + (a + 2)]
= [p + (a + 2)] * [p - (a - 1)] ——> Answer
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