Showcase extra: the real practice and quiz players do not have this button.
Correct answer: (-3, 2), (-5, 0), (-1, 0)
- Find the vertex : matches , so the vertex is .
- Set the output to 0 and solve both branches for the x-intercepts, or use and its mirror when the V never crosses: Set : . Isolate the bars: . Solve both branches: gives , and gives .
- Plot every point on a snap tick and check the opening direction: is negative, so the V opens downward from through and . Every one of those coordinates is a whole number, so each click lands exactly on a grid tick.
