document.write( "Question 1112899: Use the vertex
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Algebra.Com's Answer #727920 by ikleyn(52781) $\"\"$ $\"About$

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document.write( "From the condition, using the info about the vertex, you can write\r\n" );
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document.write( "y = a*(x-(-4))^2 - 1,    or,   which is the same\r\n" );
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document.write( "y = a*(x+4)^2 -1,\r\n" );
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document.write( "where \"a\" is unknown real coefficient.  To find \"a\", use given condition on another point. It gives you an equation\r\n" );
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document.write( "3 = a*((-6)+4)^2 -1,  which is equivalent to\r\n" );
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document.write( "4 = a*2^2,   or   4 = 4a.\r\n" );
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document.write( "Hence,  a= 1,   and your quadratic function is   y = (x+4))^2 - 1.\r\n" );
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