document.write( "Question 823125: Find the value(s) of x in the domain of f(x)= -x^2+4x+1 for which f(x) = -4. Please show all work.\r
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Algebra.Com's Answer #495283 by stanbon(75887)\"\" \"About 
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Find the value(s) of x in the domain of f(x)= -x^2+4x+1 for which f(x) = -4.
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\n" ); document.write( "Solve:
\n" ); document.write( "-x^2 + 4x + 1 = -4
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\n" ); document.write( "-x^2 + 4x + 5 = 0
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\n" ); document.write( "x^2 -4x - 5 = 0
\n" ); document.write( "Factor:
\n" ); document.write( "(x-5)(x+1) = 0
\n" ); document.write( "x = 5 or x = -1
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\n" ); document.write( "Cheers,
\n" ); document.write( "Stan H.
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