Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  (3x2 +  8x) -  16

Step  2  :

Trying to factor by splitting the middle term

 2.1     Factoring  3x²+8x-16 

The first term is,  3x²  its coefficient is  3 .
The middle term is,  +8x  its coefficient is  8 .
The last term, "the constant", is  -16 

Step-1 : Multiply the coefficient of the first term by the constant   3 • -16 = -48 

Step-2 : Find two factors of  -48  whose sum equals the coefficient of the middle term, which is   8 .

Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above,  -4  and  12 
                     3x² - 4x + 12x - 16

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

Final result :

  (3x - 4) • (x + 4)