Question

Which of the following is the conjugate of a complex number with 2 as the real part and 7 as the imaginary part?

2 + 7i

-2 - 7i
-2 + 7i

2 - 7i

Thanks!

Answer 1

"a complex number with 2 as the real part and 7 as the imaginary part"

so the original number is 2+7i

Answer 2

the conjugate of a+bi is a-bi

you can flip it around and say the conjugate of a-bi is a+bi

Answer 3

basically you flip the sign of the imaginary part

Answer 4

original: 2+7i
conjugate: ???

Answer 5

2-7i ?

Answer 6

yes

Answer 7

Thanks! <3

Answer 8

you're welcome