document.write( "Question 1106931: find the value of b such that the vertex of parabola y = x² + bx +c lies on y-axis \n" ); document.write( "

Algebra.Com's Answer #721929 by ikleyn(52803) $\"\"$ $\"About$

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\n" ); document.write( "Answer. b = 0.\r
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document.write( "    x-coordinate of the vertex is .\r\n" );
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document.write( "    The fact that the vertex lies at the y-axis means that x-coordinate of the vertex is zero,  or, in other words,  = 0.\r\n" );
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document.write( "    It implies  b = 0.\r\n" );
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