Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  9 -  52x2

Step  2  :

Trying to factor as a Difference of Squares :

 2.1      Factoring:  9-25x² 

Theory : A difference of two perfect squares,  A² - B²  can be factored into  (A+B) • (A-B)

Proof :  (A+B) • (A-B) =
         A² - AB + BA - B² =
         A² - AB + AB - B² =
         A² - B²

Note :  AB = BA is the commutative property of multiplication.

Note :  - AB + AB equals zero and is therefore eliminated from the expression.

Check :  9  is the square of  3 
Check : 25 is the square of 5
Check :  x²  is the square of  x¹ 

Factorization is :       (3 + 5x)  •  (3 - 5x) 

Final result :

  (5x + 3) • (3 - 5x)