document.write( "Question 1096609: Let f(x) = x^2 + 4x - 31. For what value of a is there exactly one real value of x such that f(x) = a? \n" ); document.write( "

Algebra.Com's Answer #711028 by ikleyn(52781) $\"\"$ $\"About$

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\n" ); document.write( "HINT: this value of x and this value of \"a\" form the vertex of the given parabola.\r
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document.write( "     =  = .\r\n" );
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document.write( "    So, this value of \"a\" is  a = -35,  and this value of \"x\" is  x = -2.\r\n" );
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