Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  ((3•5y2) +  10y) -  40

Step  2  :

Step  3  :

Pulling out like terms :

 3.1     Pull out like factors :

   15y² + 10y - 40  =   5 • (3y² + 2y - 8) 

Trying to factor by splitting the middle term

 3.2     Factoring  3y² + 2y - 8 

The first term is,  3y²  its coefficient is  3 .
The middle term is,  +2y  its coefficient is  2 .
The last term, "the constant", is  -8 

Step-1 : Multiply the coefficient of the first term by the constant   3 • -8 = -24 

Step-2 : Find two factors of  -24  whose sum equals the coefficient of the middle term, which is   2 .

Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above,  -4  and  6 
                     3y² - 4y + 6y - 8

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

Final result :

  5 • (3y - 4) • (y + 2)