9 December, 04:05
Factorise : x^2y^2-16
9 December, 05:23
(xy - 4) (xy + 4).
The is the difference of 2 squares.
a^2 - b^2 = (a - b) (a + b: so we have:
x^2y^2 - 16 = (xy - 4) (xy + 4)
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» Factorise : x^2y^2-16