Solution - Simplification or other simple results

Step  1  :

Equation at the end of step  1  :

  22x4 -  324

Step  2  :

Step  3  :

Pulling out like terms :

 3.1     Pull out like factors :

   4x⁴ - 324  =   4 • (x⁴ - 81) 

Trying to factor as a Difference of Squares :

 3.2      Factoring:  x⁴ - 81 

Theory : A difference of two perfect squares,  A² - B²  can be factored into  (A+B) • (A-B)

Proof :  (A+B) • (A-B) =
         A² - AB + BA - B² =
         A² - AB + AB - B² =
         A² - B²

Note :  AB = BA is the commutative property of multiplication.

Note :  - AB + AB equals zero and is therefore eliminated from the expression.

Check : 81 is the square of 9
Check :  x⁴  is the square of  x² 

Factorization is :       (x² + 9)  •  (x² - 9) 

Polynomial Roots Calculator :

 3.3    Find roots (zeroes) of :       F(x) = x² + 9
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  1  and the Trailing Constant is  9.

 The factor(s) are:

of the Leading Coefficient :  1
 of the Trailing Constant :  1 ,3 ,9

 Let us test ....

Polynomial Roots Calculator found no rational roots

Trying to factor as a Difference of Squares :

 3.4      Factoring:  x² - 9 

Check : 9 is the square of 3
Check :  x²  is the square of  x¹ 

Factorization is :       (x + 3)  •  (x - 3) 

Final result :

  4 • (x2 + 9) • (x + 3) • (x - 3)