Calculations based on a power four minus b power four (a^4 - b^4)

a power four minus b power four (a4 - b4)

a4- b4 = (a-b)(a+b)(a2 + b2)

proof by substituion

let value of a = 2 and b=5

a4 - b4 = a4 - 54  = 16 - 625 = -609

(a-b)(a+b)(a2 + b2) = (2-5)(2+5)(4+25) = -609

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