Can one of the cards be positive and the other be negative?

Me n o w. i need t h i s. 10 points

The point a is at –2 and the point b is at 7. marissa would like to divide this line segment in a 4: 3 ratio, and she would like to use the formula x = (x2 – x1) + x1. what values should she substitute into the formula? a = a + b = x1 = x2 =

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?