What is the conjugate of the complex number 2 - 5i?

D. 2 + 5i — The conjugate of a complex number z = a + bi is obtained by changing the sign of the imaginary part, resulting in a - bi. Therefore, the conjugate of 2 - 5i is 2 + 5i.

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$What is the conjugate of the complex number z = 2 - 5 i ?$

A. $$2 - 5i$$
B. $- 2 + 5 i$
C. $- 2 - 5 i$
D. $$2 + 5i$$

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Correct answer: D — $$2 + 5i$$

Solution

The conjugate of a complex number z = a + bi is \overset{z}{ˉ} = a - bi . Thus, the conjugate of $2 - 5i$ is $2 + 5i$.

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What is the conjugate of the complex number z=2−5i?

Solution

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$What is the conjugate of the complex number z = 2 - 5 i ?$