Can somebody help me evaluate this expression and solve the terms

What is the vertex form of f(x) = x2 + 6x + 3

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

Isabel graphed the following system of equations. 2x – y = 6 y = -3x + 4 she came up with the solution (2,-2). what were the 3 steps she did to get that solution? (make sure they are in the correct order)