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As in
x^2 – 4x + 5
D0 hence always positive
we can directly cross multiply
x^2 – 5x + 12 > 3x^2 – 12x + 15
2x^2 – 7x + 3
2x^2 – 6x – x + 3
(x – 3) (2x – 1)
x belons to (1/2 , 3)
Hope it helps
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