Question

25-100 х в квадрате=0

Answer 1

25-100 х в квадрате=0
25(1-4x²)=0
(1-2x)(1+2x)=0
x=1/2
x=-1/2

Answer 2

по-моему х=+-5

Answer 3

да

Answer 4

-100x^2=-25
x^2=25/100
x^2=1/4
x1=1/2
x2=-1/2