Interesting enough but I don't know what you use it for.

Quadratic formula is reverse equation of polynomic of grade 2.

**Y** = a + b*

**X** + c*

**X**^2

**Y** = polynomic (a,b,c,

**X**) ; X is known and Y is unknown

**X** = quadratic (a,b,c,

**Y**) ; X is unknown and Y is known

If i know steers body weight in kg is related to age in days by:

BW = -50.4 + 1.22*age - 0.000472*age^2

What age could have a steer that weighs 450 kg?

age = quadratic(-50.4, 1.22, - 0.000472, 450.0)