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

Sanderson is having trouble with his assignment. his shown work is as follows: − 3 7 7 3 = − 3 7 × 7 3 = − 21 21 = −1 however, his answer does not match the answer that his teacher gives him. complete the description of sanderson's mistake. find the correct answer.