Question

用配方法解方程:x的平方+4x-7=0

Answer 1

X^2+4X-7=0
X^2+4X=7
X^2+4X+(2)^2=7+(2)^2
(X+2)^2=11
X+2=11^0.5 or x+2= -11^0.5
x=11^0.5 -2(1.31662479) or x= -11^0.5 -2(-5.31662479)