# three problems NEED URGENT HELP

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• October 22nd 2008, 08:08 PM
keane
three problems NEED URGENT HELP
please if anyone could answer these:

#1: complex number in stranded form:
1+3i/3+4i

#2: complete the square x^2-8x+4=0

#3: find the absolute value of (2-3i)
• October 22nd 2008, 08:15 PM
Jhevon
Quote:

Originally Posted by keane
please if anyone could answer these:

#1: complex number in stranded form:
1+3i/3+4i

multiply by the conjugate of the denominator over itself. that is, to get $\frac {a + ib}{c + id}$ in standard form, multiply by $\frac {c - id}{c - id}$ and simplify

Quote:

#2: complete the square x^2-8x+4=0
see here

Quote:

#3: find the absolute value of (2-3i)
$|a + ib| = \sqrt{a^2 + b^2}$