Solution - Simplification or other simple results

Step  1  :

 1.1     10 = 2•5

(10)⁸ = (2•5)⁸ = 2⁸ • 5⁸

Equation at the end of step  1  :

  5 • (28•58)

Step  2  :

Multiplying exponents :

 2.1    5¹  multiplied by  5⁸   = 5^{(1 + 8)} = 5⁹

Final result :

  (59•28)