Amir 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), xxx seconds after Amir threw it, is modeled byh(x)=-(x+1)(x-7)How many seconds after being thrown will the ball reach its maximum height?________ secondsI know I literally just posted one a couple minutes ago but, please help me again T-T

Answer:   3 secondsStep-by-step explanation:The given equation describes a parabolic curve with zeros at x=-1 and x=7. The line of symmetry of the curve is halfway between the zeros, at ...   x = (-1 +7)/2 = 6/2 = 3The maximum of the curve is on the line of symmetry. The ball will reach its maximum height 3 seconds after being thrown._____Additional comment
The maximum height will be 16 meters.