Which sentence best defines parallel lines? A. Parallel lines are lines that intersect at 90 degree angles.
B. Parallel lines are lines in the same plane that do not intersect.
C. Parallel lines are lines that are noncoplanar and do not intersect.
D. Parallel lines are lines that occupy the same space and have all their points in common
E. Parallel lines are lines that intersect to form angles with measures not equal to 90 degrees.

answer is c chief it always is

(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.