Solution - Simplification or other simple results

Reformatting the input :

Changes made to your input should not affect the solution:

 (1): "x7"   was replaced by   "x^7". 

Step  1  :

Equation at the end of step  1  :

  (2 • (x2)) -  5x7
 Step  2  :

Equation at the end of step  2  :

  2x2 -  5x7

Step  3  :

Step  4  :

Pulling out like terms :

 4.1     Pull out like factors :

   2x² - 5x⁷  =   -x² • (5x⁵ - 2) 

Polynomial Roots Calculator :

 4.2    Find roots (zeroes) of :       F(x) = 5x⁵ - 2
Polynomial Roots Calculator is a set of methods aimed at finding values of  x  for which   F(x)=0  

Rational Roots Test is one of the above mentioned tools. It would only find Rational Roots that is numbers  x  which can be expressed as the quotient of two integers

The Rational Root Theorem states that if a polynomial zeroes for a rational number  P/Q   then  P  is a factor of the Trailing Constant and  Q  is a factor of the Leading Coefficient

In this case, the Leading Coefficient is  5  and the Trailing Constant is  -2.

 The factor(s) are:

of the Leading Coefficient :  1,5
 of the Trailing Constant :  1 ,2

 Let us test ....

Polynomial Roots Calculator found no rational roots

Final result :

  -x2 • (5x5 - 2)