Posted by Sheila on Tuesday, September 6, 2011 at 8:12pm.
Please helpI'm stuck really bad
Thank you for any help you can provide
What are the roots of the equation x^2 4x + 3 = 0
x^2  4x = 3
x^2 +2(2)x + 2^2 = 3 = 2^2
x^2 + 4x + 4 = 1
(x + 2)^2 = 1
qrt (x+2)^2 = sqrt 1
x+2 = plus or minus 1
therefore x=1
x=3 roots are 1 and 3

PreCalcPlease check my answer  bobpursley, Tuesday, September 6, 2011 at 8:14pm
You did this about the most difficult way.
Consider:
x^24x3=0
(x1)(x3)=0
x= 1, or 3

PreCalcPlease check my answer  Damon, Tuesday, September 6, 2011 at 8:16pm
x^2 4x + 3 = 0
factor
(x3)(x1) = 0
x = 3 or x = 1
or complete the square as you tried
x^2 4 x = 3 note sign change of 3
x^2  4 x + 4 = 3 +4 = 1
(x2)^2 = 1
x = 2 +/ 1
x = 1 or x = 3

PreCalcPlease check my answer  ALISON, Tuesday, September 6, 2011 at 8:16pm
I believe you are trying to factor the polynomial.
so x^2 4x+3
(x1)(x3) =0
x= 1,3

PreCalcPlease check my answer  Damon, Tuesday, September 6, 2011 at 8:19pm
Alison, I am sure Sheila was trying to do it by completing the square. Note taking half of the coef. of x and squaring it. Factoring is too easy.

PreCalcPlease check my answer  Sheila, Tuesday, September 6, 2011 at 8:21pm
I did do it the long wayyou way is much simpler Thank you all
Answer This Question
Related Questions
 PreCalc/Trig  Please helpI'm stuck really bad What are the roots of the ...
 PreCalculus/Trig Check please and help  Could someone please check the first ...
 PreCalcPlease check my answerI think its correc  Could someone please check ...
 PreCalcPlease check my answerI think I have it  Could someone please check ...
 PreCalcPlease check my answerI think I have it  Could someone please check ...
 PreCalculus  Sorry to be a pest but I never got an answer and I'm really stuck...
 Algebra II Please check  Please helpWhat is the equation of the ellipse with ...
 Algebra IIPlease check  Please helpWhat is the equation of the ellipse with ...
 PreCalc  Please help me with this problemI'm stuck (x2)/(x+2) = (x+10)/x I'm...
 PreCalcPlease check  I have three questions: 1. What is the remainder of (x^3...
More Related Questions