Question 313419
{{{ h^2-4h-7=0 }}}
Complete the square:
{{{ h^2-4h = 7 }}}
Add 1/2 'b' squared to both sides:
{{{ h^2-4h +4 = 7+4 }}}
{{{ h^2-4h+4 = 11 }}}
Factoring the left:
{{{ (h-2)(h-2) = 11 }}}
{{{ (h-2)^2 = 11 }}}
{{{ h-2 = sqrt(11) }}}
{{{ h = sqrt(11) + 2 }}}
{{{ h = 5.32 }}}