Posted by Christina on Wednesday, January 5, 2011 at 10:07pm.
x^24x+12=0 Complete the square to solve for x.
Okay I know how to do up to here:
(4/2)^2 12=x^24x(4/2)^2
212= x^24x+2
10= DO I FACTOR IT?
 Math Algebra II  Reiny, Wednesday, January 5, 2011 at 10:46pm
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
 Math Algebra II  Kay, Wednesday, January 5, 2011 at 11:08pm
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!
Answer this Question
Related Questions
 Algebra  My homework is to solve by completing the square. But how can you ...
 Algebra  Complete the square for the binomial. Then factor the resulting ...
 Algebra  Complete the square for the binomial. Then factor the resulting ...
 Algebra I  The distance an object falls is directly propotional to the square ...
 algebra  solve the polynomial y=2x^24x+1 For Further Reading algebra  Reiny, ...
 algrebra 2  it is called completing the square here is the equation 4x^24x+1=9...
 Pre Cal  Ooops! I wrote it wrong, here's the problem: if x varies directly as y...
 math,help,algebra I  I need help can someone help me get unstuck and let me ...
 Math  She wants us to complete the square for this problem, but I cannot get it...
 Algebra Word problem  I don't know how to put in a square root symbol here so ...