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Posted by kori on Wednesday, January 2, 2013 at 11:18pm.
f(x)=4-x^2 simplify completly. Use difference quotient.
( x - 2 ) ( x + 2 ) = x ^ 2 - 2 x + 2 x - 4 = x ^ 2 - 4 = - ( x ^ 2 - 4 ) = 4 - x ^ 2 So : 4 - x ^ 2 = - ( x - 2 ) ( x + 2 )
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