Question

Помогите!
5-x=корень из(1+х)

Answer 1

5-x=sqrt(1+x)
(5-x)*(1+x)=1+x5+x-x-x^2=1+x
5-x-x^2-1=0
4-x-x^2=0
D=1+16=17
x1=(1+sqrt17)/2x2=(1-sqrt17)/2