a) (x+5)(x-5)
b) (x+9)(x-9)
c) (5x+2y)(5x-2y)
d) (ab²c+8)(ab²c-8)
a)x²-25
b)x²-81
c)25x²-4y²
d)a²b^4c²-64
x2-25
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Verified answer
a)x²-25
b)x²-81
c)25x²-4y²
d)a²b^4c²-64
x2-25