A hovercraft takes off from a platform.
Its height (in meters), xxx seconds after takeoff, is modeled by
h(x)=-(x-11)(x+3)h(x)=−(x−11)(x+3)h , left parenthesis, x, right parenthesis, equals, minus, left parenthesis, x, minus, 11, right parenthesis, left parenthesis, x, plus, 3, right parenthesis
What is the height of the hovercraft at the time of takeoff?