Saturday

January 31, 2015

January 31, 2015

Posted by **kim** on Saturday, October 31, 2009 at 3:17pm.

1/2+i

2+i/2-i

- precalc -
**bobpursley**, Saturday, October 31, 2009 at 3:21pmrationalize the denominator. I will do one:

(2+i)/(2-i)= 2+i)(2+i)/(2-i)(2+i)=

(2+i)^2/(2-i^2)= (4+4i+i^2)/3

you can complete it.

- precalc -
**kim**, Saturday, October 31, 2009 at 3:34pmso is that the final answer

- precalc -
**kim**, Saturday, October 31, 2009 at 3:36pmos is the final answer 8i+i^3/3

- precalc -
**MathMate**, Sunday, November 1, 2009 at 11:30am(2+i)/(2-i)

=(2+i)(2+i)/((2+i)(2-i))

=(4+4i+i²)/(2²-i²)

=(4+4i-1)/(4-(-1))

=(3+4i)/5

You can proceed along the same lines for the first problem.

**Answer this Question**

**Related Questions**

Precalc - Represent the complex number graphically and find the standard form of...

Precalc - Write the complex number z = −6 in polar form

Mathematics - Express the Complex Number -1-i in polar form. how is complex no ...

Precalc - Convert the complex number c=3cis 0.25 into rectangular form.

Precalc - Write the complex number z = 2 + 5i in polar form, rounding to the ...

trigonometry - 1)Solve and write in standard form: 4x^2-4x+21=0 2)Find the ...

math - Express the complex number 8(cos30 degrees + i sin30 degrees)sin in ...

precalc - Suppose that z1=6-8i. Find: A. The Trig Form of the complex number z1...

MATH/ Check? - Correct. what is pi The definition or the number? The number is 3...

Pre-Calculus - Express the complex number in polar form. 5-12i