4x²-x-1
=4x²-x+1/16-17/16
=(2x-1/4)²-17/16
=(2x-1/4+√17/4)(2x-1/4-√17/4);
很高兴为您解答,skyhunter002为您答疑解惑
如果本题有什么不明白可以追问,