I need help on this math please help me on this tnx

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 =

Math i have no idea how to do a and b

Find a third-degree polynomial equation with rational coefficients that has roots -2 and 6+i