document.write( "Question 864738: f(x) = x^4 + 2x^3 - 252x^2 - 54\r
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Algebra.Com's Answer #521251 by ewatrrr(24785) $\"\"$ $\"About$

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document.write( "Hi
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document.write( "f(x) = x^4 + 2x^3 - 252x^2 - 54
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document.write( "f' = x(4x^2 + 6x - 504) = x(4 - 42)(x  + 12)
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document.write( "x = -12, 0 , 10.5
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document.write( "f(x) is decreasing when x < -12   and  when 0 < x < 10.5 \n" );
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