The leading term of f(x) is −7x.

part a: what is the correct verbal description of the end behavior of f(x)?

part b: what is the correct symbolic description of the end behavior of f(x)?

select one answer for part a, and one answer for part b.

b: as x→∞, f(x)→−∞, and as x→−∞, f(x)→−∞.
a: as x approaches infinity, f(x) approaches negative infinity, and as x approaches negative infinity, f(x) approaches infinity.
b: as x→∞, f(x)→−∞, and as x→−∞, f(x)→∞.
a: as x approaches infinity, f(x) approaches negative infinity, and as x approaches negative infinity, f(x) approaches negative infinity.
a: as x approaches infinity, f(x) approaches infinity, and as x approaches negative infinity, f(x) approaches infinity.
b: as x→∞, f(x)→∞, and as x→−∞, f(x)→∞.
a: as x approaches infinity, f(x) approaches infinity, and as x approaches negative infinity, f(x) approaches negative infinity.
b: as x→∞, f(x)→∞, and as x→−∞, f(x)→−∞.