Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  (2x217 • x) -  30
 Step  2  :
 Step  3  :

Pulling out like terms :

 3.1     Pull out like factors :

   2x²¹⁸ - 30  =   -2 • (15 - x²¹⁸) 

Trying to factor as a Difference of Squares :

 3.2      Factoring:  15 - x²¹⁸ 

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 :  15  is not a square !!

Ruling : Binomial can not be factored as the
difference of two perfect squares

Final result :

  -2 • (15 - x218)