for the conjugate of the complex number c = 2 - i.
This languages problem is solved step by step below, with detailed explanations to help you understand the method and arrive at the correct answer.
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Here are the solutions to the problems:
Question 27:
The question asks for the conjugate of the complex number $c = 2 - i$.
The conjugate of a complex number $a - bi$ is $a + bi$.
Therefore, the conjugate of $2 - i$ is $2 + i$.
The correct option is 3.
$$\boxed{\text{3}}$$
Question 28:
The question asks for the solution set of the equation $c^2 + 7c - 12 = 0$.
We use the quadratic formula $c = \frac{-b \pm \sqrt{b^2 - 4ac}}{2a}$.
Here, $a=1$, $b=7$, $c
