tathagata7
New member
- Joined
- Sep 15, 2016
- Messages
- 31
Greetings:
I would like to verify my work answer for the below SSAT question.
Thank you
Robert throws a rock into the air. The rock’s height, y, in feet with respect to time, x, in seconds, can be modeled by the function y=−2x^2 +4x +16 How many seconds does it take the rock to hit the ground after Robert threw it?
Test Answer 4
My work:
y=−2x^2 +4x +16
-2(x^2 -2x -8) = 0 (is it correct to divide everything by -2)
(x-4) (x+2) = 0
(4, -2)
Since answer has to be positive it’s 4
I would like to verify my work answer for the below SSAT question.
Thank you
Robert throws a rock into the air. The rock’s height, y, in feet with respect to time, x, in seconds, can be modeled by the function y=−2x^2 +4x +16 How many seconds does it take the rock to hit the ground after Robert threw it?
Test Answer 4
My work:
y=−2x^2 +4x +16
-2(x^2 -2x -8) = 0 (is it correct to divide everything by -2)
(x-4) (x+2) = 0
(4, -2)
Since answer has to be positive it’s 4