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a^2-b^2=(a-b)(a+b)
a)
25a^2 - 16b^2=(5a)^2 - (4b )^2=
=(5a - 4b)(5a + 4b)
b)
16x^4 -36y^2=(4x^2)^2 - (6y)^2=
=(4x^2 - 6y)(4x^2+6y)
c)
8a^6 -25=(\/8 a^3)^2 - 5^2=
=(\/8a^3 -5)(\/8a^3 +5)
\/8 =2\/2 \/ - pierwiastek