X的平方+2KX-3K的平方能被(X-1)整除,求K值.
问题描述:
X的平方+2KX-3K的平方能被(X-1)整除,求K值.
答
x^2 + 2kx - 3k^2
= (x - 1)(x + a)
= x^2 + (a - 1)x - a
所以:
a- 1 = 2k
a = 3k^2
3k^2 - 2k - 1 = 0
k = 1,-1/3