Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  ((2•5x2) -  9x) -  9

Step  2  :

Trying to factor by splitting the middle term

 2.1     Factoring  10x²-9x-9 

The first term is,  10x²  its coefficient is  10 .
The middle term is,  -9x  its coefficient is  -9 .
The last term, "the constant", is  -9 

Step-1 : Multiply the coefficient of the first term by the constant   10 • -9 = -90 

Step-2 : Find two factors of  -90  whose sum equals the coefficient of the middle term, which is   -9 .

Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above,  -15  and  6 
                     10x² - 15x + 6x - 9

Step-4 : Add up the first 2 terms, pulling out like factors :
                    5x • (2x-3)
              Add up the last 2 terms, pulling out common factors :
                    3 • (2x-3)
Step-5 : Add up the four terms of step 4 :
                    (5x+3)  •  (2x-3)
             Which is the desired factorization

Final result :

  (2x - 3) • (5x + 3)