配方:x的平方-5x-10

来源:学生作业帮助网 编辑:六六作业网 时间:2024/10/04 16:02:22
配方:x的平方-5x-10配方:x的平方-5x-10配方:x的平方-5x-10解x²-5x-10=(x²-5x+25/4)-25/4-10=(x-5/2)²-65/4x^

配方:x的平方-5x-10
配方:x的平方-5x-10

配方:x的平方-5x-10

x²-5x-10
=(x²-5x+25/4)-25/4-10
=(x-5/2)²-65/4

x^2-5x-10
=(x-5/2)^2-25/4-10
=(x-5/2)^2-65/4

x²-5x-10
=x²-5x+(5/2)²-10-25/4
=(x-5/2)²-65/4
=[(x-5/2)+(√65)/2][(x-5/2)-(√65)/2]
=[x-(5+√65)/2][x-(5-√65)/2]