Question

1) -x sobre 2 + 49=0
2)-25+100 sobre 2=0
conta pfv

Answer 1

-x²+49 =0 
delta = 0 +4*49
delta = 196

x= 0 +- 14/-2 
x'= -7
x''= 7 

Answer 2

-x/2+49=0
-x/2=-49
-x=-49.2
-x=-198 .(-1)
X=198
-25+100/2=0
75/2=0
36,5