The expression 4x^2 + bx - 45, where b is a constant, can be rewritten as (hx + k) (x + j), where...

Bluebook Digital SAT Test 4 Module 2 (Hard) Question 15:

The expression 4x^2 + bx - 45, where b is a constant, can be rewritten as (hx + k) (x + j), where h, k, and j are integer constants. Which of the following must be an integer?

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