Answer:
option:C
Step-by-step explanation:
A) on putting x=5 in equation [tex]x^2-5x+25=0[/tex] we have that the equation is not equal to 0 it gives the value 25. so {5} is not a solution set of A.
B) on putting x=5 in the equation [tex]x^2+10x+25=0[/tex] we have the equation is not equal to 0 it gives the value 100. so {5} is not a solution set of B.
C)on putting x=5 in the equation [tex]x^2-10x+25=0[/tex], the equation gives the value 0. so {5} is a solution set of C.
D)on putting x=5 in the equation [tex]x^2+5x+25=0[/tex] equation does not give the value zero it gives 75. so {5} is not a solution set for D.
