Answer:
Two solutions were found :
 x = -4
 x = 1/2 = 0.500
Step-by-step explanation:
Step  1  :
Equation at the end of step  1  :
  (2x - 1) • (x + 4)  = 0 
Step  2  :
Theory - Roots of a product :
 2.1    A product of several terms equals zero. 
 When a product of two or more terms equals zero, then at least one of the terms must be zero. 
 We shall now solve each term = 0 separately 
 In other words, we are going to solve as many equations as there are terms in the product 
 Any solution of term = 0 solves product = 0 as well.
Solving a Single Variable Equation :
 2.2      Solve  :    2x-1 = 0
 Add  1  to both sides of the equation : 
                      2x = 1
Divide both sides of the equation by 2:
                     x = 1/2 = 0.500
Solving a Single Variable Equation :
 2.3      Solve  :    x+4 = 0 
 Subtract  4  from both sides of the equation : 
                      x = -4
Two solutions were found :
 x = -4
 x = 1/2 = 0.500
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