Expand the expression in the equation (−x−4)(5x−2)=0 We get the quadratic equation −5x2−18x+8=0 This equation is of the form
a*x^2 + b*x + c = 0
A quadratic equation can be solved using the discriminant. The roots of the quadratic equation: x1=2aD−b x2=2a−D−b where D = b^2 - 4*a*c - it is the discriminant. Because a=−5 b=−18 c=8 , then