Solution - Linear equations with one unknown

Rearrange:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

                     7*n^2-(35*n)=0 

Step by step solution :

Step  1  :

Equation at the end of step  1  :

  7n2 -  35n  = 0 

Step  2  :

Step  3  :

Pulling out like terms :

 3.1     Pull out like factors :

   7n² - 35n  =   7n • (n - 5) 

Equation at the end of step  3  :

  7n • (n - 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  :    7n = 0 

 Divide both sides of the equation by 7:
                     n = 0

Solving a Single Variable Equation :

 4.3      Solve  :    n-5 = 0 

 Add  5  to both sides of the equation : 
                      n = 5

Two solutions were found :

1.  n = 5
2.  n = 0