①化简:(根号5+根号6)(根号5-根号6) ②解方程:x²+2x+6=1-4x

问题描述:

①化简:(根号5+根号6)(根号5-根号6) ②解方程:x²+2x+6=1-4x
①化简:(根号5+根号6)(根号5-根号6)
②解方程:x²+2x+6=1-4x

①化简:(根号5+根号6)(根号5-根号6)
=(根号5)²-(根号6)²
=5-6
=-1
②解方程:
x²+2x+6=1-4x
x²+6x+5=0
(x+1)(x+5)=0
x=-1或x=-5