若代数式(2k-1)x2+2(k+1)x+4是完全平方式,则k的值是
问题描述:
若代数式(2k-1)x2+2(k+1)x+4是完全平方式,则k的值是
答
(2k-1)x^2+2(k+1)x+4=〔√(2k-1)x〕^2+2(k+1)x+2^2上式是完全平方式时,只能写成如下形式〔√(2k-1)x±2〕^2=〔√(2k-1)x〕^2±4√(2k-1)x+2^2由等式〔√(2k-1)x〕^2+2(k+1)x+2^2和〔√(2k-1)x〕^2±4√(2k-1)x+2^2...