How to Factor -4x^2-8-45

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

(05.03 mc) part a: explain why the x-coordinates of the points where the graphs of the equations y = 4x and y = 2x−2 intersect are the solutions of the equation 4x = 2x−2. (4 points) part b: make tables to find the solution to 4x = 2x−2. take the integer values of x between −3 and 3. (4 points) part c: how can you solve the equation 4x = 2x−2 graphically? (2 points)

Find two numbers if their sum is 91 and the ratio is 6: 7?