For which values of c does the following polynomial have two complex roots? x²+4x+c

What is the best way to answer questions with a x expression in the question. for example 3x + 10x=?

Which of the following best describes the graph below? + + 2 + 3 + 4 1 o a. it is not a function. o b. it is a one-to-one function. o c. it is a many-to-one function. o d. it is a function, but it is not one-to-one.

Given the expression (7 ? 4i) ? (2 + 6i), perform the indicated operation and write the answer in the form a + bi.