Known x

Known x

The original formula = (16x & sup2; - 28x + 10 + 1) / (4x-5)
=[(4x-5)(4x-2)+1]/(4x-5)
=4x-2+1/(4x-5)
=4x-5+1/(4x-5)+3
Let a = 5-4x
x0
Then a + 1 / a > = 2 √ (a * 1 / a) = 2
Then - (a + 1 / a) + 3