Question 28715
{{{ 4-4y-y^2=0 }}}
{{{ -4+4y+y^2=0 }}}
{{{ y^2+4y-4=0 }}}
{{{ y = (-b +- sqrt(b^2 - 4ac))/(2a)}}}
{{{ y = (-(4) +- sqrt((4)^2 - 4(1)(-4)))/(2(1))}}}
{{{ y = (-4 +- sqrt(16 + 16))/(2)}}}
{{{ y = (-4 +- sqrt(32))/(2)}}}
{{{ y = (-4 +- sqrt(16*2))/(2)}}}
{{{ y = (-4 +- sqrt(16)sqrt(2))/(2)}}}
{{{ y = (-4 +- 4sqrt(2))/(2)}}}
{{{ y = (4(-1 +- sqrt(2)))/(2)}}}
{{{ y = 2(-1 +- sqrt(2))}}}



jon.