# factorize using factor theorem or vanishing method.

2
by rupemon
yaeh i figured it out... thanx for ur help

2014-05-18T20:39:56+05:30
Take the factors of 12 as +_1 +_2 +_3  +_4 +_5 +_6..........
put the value of x as-1 and then solve it which will leave 0 as remainder now through long division method solve it. take that long term as divident and x+1 as divisor and solve it this will give u p(x) =
= now take the commons
=
=
(x+1)(x-3)(x² - 4 ) are the factors...
2014-05-19T16:41:35+05:30
X^4 - 2x^3 - 7x^2 + 8x + 12 is zero at x = 2 hence (x - 2) is a factor of this equation
x^3(x -2) - 0x^2(x - 2)  - 7x(x  - 2) - 6(x - 2)
(x - 2)(x^3 - 7x - 6)
x^3 - 7x - 6  is zero at x = -2 , hence (x + 2) is a factor of this equation
x^2(x + 2) - 2x(x + 2) - 3(x + 2)
(x + 2)(x^2 - 2x - 3)
(x + 2)(x^2 - 3x + x - 3)
(x + 2)(x -3)(x + 1)
hence factor of given equation is (x - 2)(x + 2)(x - 3)(x + 1)