Question 637780
x^2-64<0 and x^2-64>0
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x^2-64<0
(x+8)(x-8)<0
number line
<...+...-8...-....8...+....>
solution: (-8,8)
..
 x^2-64>0
(x+8)(x-8)>0
number line
<...+...-8...-....8...+....>
solution: (-&#8734;,-8) U (8,&#8734;)