已知多项式KX的平方-6XY-8Y的平方可分解成(2MX+2Y)(X-4Y),求K,M的值.哥哥姐姐们,我急,

问题描述:

已知多项式KX的平方-6XY-8Y的平方可分解成(2MX+2Y)(X-4Y),求K,M的值.
哥哥姐姐们,我急,

(2MX+2Y)(X-4Y)
=2mx^2-8mxy+2xy-8y^2
=2mx^2-(8m-2)xy-8y^2
=kx^2-6xy-8y^2
一一对应得:k=2m,6=8m-2
解得:m=1,k=2