Question 311605
Convert to vertex form by completing the square,
{{{y = (1/2)x^2-2x-3}}}
{{{y = (1/2)(x^2-4x)-3}}}
{{{y=(1/2)(x^2-4x+4)-3-2}}}
{{{y=(1/2)(x-2)^2-5}}}
x=2.
d) is the correct answer.
{{{drawing( 300, 300, -3, 7, -10, 10,  green(line(2,-10,2,10)),graph( 300, 300, -3, 7, -10, 10, (1/2)x^2-2x-3)) }}}