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Verified answer
1. X^2 - 6x + 8= 0(X-4) (X-2) = 0
2. X^2 + 9x + 20= 0
(X+5) (X+4) = 0
3. X^2 + 7x + 12= 0
(X+4) (X+3) = 0
4. P^2 - 5p + 4= 0
(P-4) (P-1) = 0
5. A^2 + 8a + 12= 0
(A+6) (A+2) = 0