Math Word Problem. I have no clue. 10 POINTS!?

Question

The temperature T (in degrees fahrenheit) of saturated steam increases as pressure increases. This relationship is approximated by the model.

T= 75.82 -2.11x +43.5√x

5 is less than or equal to x and x is less than or equal to 40

where x is the absolute pressure (in pounds per square inch). Approximate the pressure when the temperature of the steam is 240 degrees F.

Thanks for the help guys, I am completely lost...WHOEVER shows their work and gets right answer will get 10 points.

Answer 1

240=75.82-2.11(√x)^2-2.11x

x= 24.746

Answer 2

T= 75.82 -2.11x +43.5√x

First I transposed the equation

43.5√x - 2.11x - 164.18 = 0

Then I ran an iteration and got x = 24.74678718411

Insert 5 -> x = -77.461

Insert 40 -> x = 26.538

Then converge to x = 0