Which statement is NOT a step when constructing a inscribed square? A: draw a diameter of the circle using a straight edge
B: swing in arc the radius of the point on a circle
C: placed a compass on the point where the circle diameter intersect
D:Swing two arcs above and below the diameter

i don't even know how to read that, ill try to do it if you translate it into english.

i dont know this one sorry

(a) x intercepts: -6 and 2

you can obtain these by solving the equation 0=x^2 +4x-12 using your favorite quadratic formula. but it is easy to verify -6 and 2 indeed satisfy this equation.

(b) y intercept: -12

this is obtained by setting x=0: 0^2+4*0-12 = -12

(c) the minimum value is: -16 (this is the vertex)

you can get the vertex by rewriting the equation into the form:

there is no global or local maximum as the function goes to infinity, so only in the limit sense: +infinity.