Step-by-step explanation:
hint : the "arms" of the parabola don't go straight up. they keep bending outwards but get closer and closer to straight up lines. but they never turn into straight up lines.
1.a.
one important fact about parabolas : they are perfectly left-right (or up-down) symmetrical about the vertex.
so, if one solution (zero) is on the left side of the vertex, the other solution is then on the right side of the vertex with the same horizontal distance from the vertex as the left one. just in the other direction.
(-5, 0) has the horizontal distance from (-2, -4) of 3, as
|-5 - -2| = |-5 + 2| = |-3| = 3.
now, when we add the horizontal distance of 3 to the vertex into the other direction (right), we get
(-2 + 3, 0) = (1, 0)
therefore, the positive solution is
(1, 0)
