Antoine stands on a balcony and throws a ball to his dog, who is at ground level. the ball's height (in meters above the ground), x xx seconds after antoine threw it, is modeled by: h ( x ) = − 2 x 2 + 4 x + 1 6 h(x)=−2x 2 +4x+16h, left parenthesis, x, right parenthesis, equals, minus, 2, x, start superscript, 2, end superscript, plus, 4, x, plus, 16 how many seconds after being thrown will the ball hit the ground?