Question 996504
-4=19x-5x^2
make it into a quadratic equation on the left
5x^2 - 19x - 4 = 0
Use the quadratic formula, completing the square works well when the coefficient of x^2 is 1, but not here
a=5; b=-19; c=-4
I got x = -.2 and x = 4 (checks out in the original equation)