Posted by Christina on Wednesday, January 5, 2011 at 10:07pm.
x^2  4x = 12
x^2  4x + 4 = 12 + 4
(x2)^2 = 8
x2 = ± √8 , but √8 = 2√2 √1 = 2i√2
x = 2 ± 2i√2
Easist way always is to go and get the roots:
(b + sqrt(b^2  4ac)) / 2a

x^2 4x +12 = 0
a= 1, b=4 c = 12
((4) + sqrt(16  4*12)) / 2

(4 + sqrt(32))/2

4 + sqrt(i^2 * 16 *2))/2

note : i^2 = 1
(4 + i 4 sqrt(2))/2

Ans:
2+ 2i sqrt(2)

are the two roots
Hope this helps Christine!
Related Questions
Simplifying Rational Expressions  Can someone PLEASE solve these for me 1.4x12...
Simplifying Rational Expressions  Can someone slove these for me 1.(4x12)/4x 2...
algebra2  Solve each of the following quadratic equations. can some explain how...
Algebra IIPlease check my solution  Solve by elimination methodthanks fro ...
calculus  pleaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaasw help can you pleaaaaase ...
math/algebra  add:Express in simplest form 4x/(x^2 18x +72) + 4/(x6) factor ...
math,help,factoring  i need help i don't know how to do the next step. factor ...
Simplifying Rational Expressions  1. 4x12/4x 2. d+7/d^249 3.t225/t^2+t20 4....
Algebra II  How do I solve the following problems?? 1. Factor: 4x^2100y^2 2. ...
ALGEBRA  1, Factor each expression x^2  10x  24 A. (x + 4)(x  6) B. (x + 6)(...