Mathematics
Question:
find the roots of (x-2)/(x+2)=(1)/(x-3)?
likeyoucare
2010-10-11 10:57:41 UTC
stuck on a math problem, i dont know where to start x.x
find the roots (x-2)/(x+2)=(1)/(x-3)
Six answers:
?
2010-10-11 11:04:23 UTC
... (x-2) / (x+2) = (1) / (x-3) ← x ≠ -2 or 3 else entire equation becomes undefined
or (x-2) (x-3) = (1)(x+2)
or x^2 - 5x + 6 = x + 2
or x^2 - 6x + 4 = 0
or x^2 - 6x + 4 = 0
Use the quadratic formula:
x = [ -b ± √ ( (b)² - 4(a)(c) ) ] / 2(a)
x = [ -(-6) ± √ ( (-6)² - 4(1)(4) ) ] / 2(1)
x = [ 6 ± √ ( (36 - 16) ] / 2
x = [ 6 ± √20 ] / 2
x = [ 6 ± 2√5 ] / 2
x = 3 ± √5
x = {3-√5, 3+√5) ~ (0.7639, 5.2361)
Mathmom
2010-10-11 11:04:51 UTC
(x - 2) / (x + 2) = 1 / (x - 3)
Cross multiply:
(x - 2) (x - 3) = 1 (x + 2)
x^2 - 5x + 6 = x + 2
x^2 - 6x = -4
x^2 - 6x + 9 = 9 - 4
(x - 3)^2 = 5
x - 3 = ±√5
x = 3 ± √5
avip
2010-10-11 10:59:10 UTC
(x-2)/(x+2)=(1)/(x-3)
=> (x-2)(x-3) = (x+2)
=> x² -5x +6 = x + 2
=> x² -6x + 4 = 0
=> x1 =√5 + 3 , x2 = √5 - 3
Morningfox
2010-10-11 11:00:39 UTC
Multiply both sides by (x+2)(x-3). That will give you a polynomial, which you should be able to solve.
2010-10-11 11:00:16 UTC
x=3-sqrt(5)
x=3+sqrt(5)
?
2010-10-11 11:36:58 UTC
(x-3)(x-2)(x+2)-1=0;
(x^2-4)(x-3)-1=0;
x^3-3x^2-4x+11=0;
x(x^2-3x-4)+11=0;
y=x-1;
y^3+px+q=0;
p=3-4=-1;
q=2(-3)^3/27-3*4/3+11=5;
Q=-1/3+25/4;
A=sqrt(3)(-5/2+sqrt(Q));
B=sqrt(3)(-5/2-sqrt(Q));
y1=A+B; y2,3=-(A+B)/2+-i(A-B)sqrt(3)/2;
i=sqrt(-1);
x1,2,3=y1,2,3+1
ⓘ
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