factorise 16x^4-144x^2
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Frist a fall
16x^ 4 - 144 x ^2
(2x)^4 - (12x)^2
we can write ((2x)^2)^2
((2x)^2 + 12x) ((2x)^2 -12x )
16x^ 4 - 144 x ^2
(2x)^4 - (12x)^2
we can write ((2x)^2)^2
((2x)^2 + 12x) ((2x)^2 -12x )
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