Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  ((2•5x2) +  3x) -  4

Step  2  :

Trying to factor by splitting the middle term

 2.1     Factoring  10x²+3x-4 

The first term is,  10x²  its coefficient is  10 .
The middle term is,  +3x  its coefficient is  3 .
The last term, "the constant", is  -4 

Step-1 : Multiply the coefficient of the first term by the constant   10 • -4 = -40 

Step-2 : Find two factors of  -40  whose sum equals the coefficient of the middle term, which is   3 .

Step-3 : Rewrite the polynomial splitting the middle term using the two factors found in step 2 above,  -5  and  8 
                     10x² - 5x + 8x - 4

Step-4 : Add up the first 2 terms, pulling out like factors :
                    5x • (2x-1)
              Add up the last 2 terms, pulling out common factors :
                    4 • (2x-1)
Step-5 : Add up the four terms of step 4 :
                    (5x+4)  •  (2x-1)
             Which is the desired factorization

Final result :

  (2x - 1) • (5x + 4)