Solution - Linear equations with one unknown

Step by step solution :

Step  1  :

Equation at the end of step  1  :

  (2x - 5) • (x - 7)  = 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-5 = 0 

 Add  5  to both sides of the equation : 
                      2x = 5
Divide both sides of the equation by 2:
                     x = 5/2 = 2.500

Solving a Single Variable Equation :

 2.3      Solve  :    x-7 = 0 

 Add  7  to both sides of the equation : 
                      x = 7

Two solutions were found :

1.  x = 7
2.  x = 5/2 = 2.500