Question

If a(x) = 2x - 4 and b(x) = x + 2, which of the following expressions produces a quadratic function?

(ab)(x)
(a/b)(x)
(a - b)(x)
(a + b)(x)

Answer 1

(a-b)(x)

(a+b)(x)

Explanation:

Technically those 2 answers will give you a quadratic function. Whether you subtract or add a(x) and b(x), when you multiply x into both, you will get a quadratic (both equations will have highest degree of 2)