Solution - Linear equations with one unknown

Step by step solution :

Step  1  :

Equation at the end of step  1  :

  25c +  (2•5c2)  = 0 

Step  2  :

Step  3  :

Pulling out like terms :

 3.1     Pull out like factors :

   10c² + 25c  =   5c • (2c + 5) 

Equation at the end of step  3  :

  5c • (2c + 5)  = 0 

Step  4  :

Theory - Roots of a product :

 4.1    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 :

 4.2      Solve  :    5c = 0 

 Divide both sides of the equation by 5:
                     c = 0

Solving a Single Variable Equation :

 4.3      Solve  :    2c+5 = 0 

 Subtract  5  from both sides of the equation : 
                      2c = -5
Divide both sides of the equation by 2:
                     c = -5/2 = -2.500

Two solutions were found :

1.  c = -5/2 = -2.500
   
2.  c = 0