## anonymous 4 years ago Describe the usefulness of the conjugate and its effects on other complex numbers?

1. anonymous

i got it hold on

2. anonymous

The conjugate it's used to solve operations with complex numbers.Conjugation of a complex number describes an axial symmetry of the complex plane. To conjugate a complex number, reflect its position through. Conjugation of a complex number describes an axial symmetry of the complex plane. To conjugate a complex number, reflect its position through the real axis. This geometric significance is used a lot

3. anonymous

. In mathematics, complex conjugates are a pair of complex numbers

4. anonymous

done

5. anonymous

Any complex number may be written as $a+ib$ where $a,b \in \mathbb{R}$ The complex conjugate of $a+ib$ is $a-ib$ The effect of the conjugate can be seen under the various operations: $a+ib - (a-ib) = 2ib \in \mathbb{C}$ $a+ib + (a-ib) = 2a \in \mathbb{R}$ $(a+ib)(a-ib) = a^2 +b^2 \in \mathbb{R}$ $\frac{a+ib}{a-ib} = \frac{(a+ib)^2}{(a-ib)(a+ib)} = \frac{a^2+2abi-b^2}{a^2+b^2} = \frac{1}{a^2+b^2}([a^2-b^2] + i[2ab])$

6. anonymous

Notice that $\sqrt{(a+ib)(a-ib)} = \sqrt{a^2+b^2} = |a+ib|$ (the modulus)

7. anonymous

A complex multiplied by its conjugate is reduced to a real no. So, it helps while rationalizing, especially the denominators.