Each equation given below describes a parabola. which statement best
compares their graphs?
y=-3x2
y=-7x2
a. both parabolas open to the left, and y = -7x2 is wider than y=-3x2
o
b. both parabolas open downward, and y = -7x2 is wider than y=-3x2.
o
c. both parabolas open to the left, and y = -3x2 is wider than y = -7x2.
o
d. both parabolas open downward, and y = -3x2 is wider than y = -7x2.

i do not know this sorry : (

step-by-step explanation:

this can be solved first with pythagorean theorem, which tells us to square both legs of the triangle and sum it. this will be equal to the square of the hypotenuse.

the hypotenuse is the side "opposite" the 90 degree angle, which is x.

so we can write using pythagorean theorem,

simplifying:

to further simplify this radical, we need to use the property  

thus