Question

Rico is asked to graph a parabola given the equation y=−x2−2x . At which point would he graph the vertex of the parabola?(1 point)

(−1,1)

(−1,2)

(−1,0)

Answer 1

(−1, 1)

Using the vertex formula x = −b/(2a) for y = ax^2 + bx + c: here a = −1, b = −2, so x = −(−2)/(2·−1) = −1. Plugging in gives y = −(−1)^2 − 2(−1) = −1 + 2 = 1.