1.
a^+b^+4a-6b+13=0
a^+4a+4+b^-6b+9=0
(a+2)^+(b-3)^=0
a+2=0
a=-2
b-3=0
b=3
2.
(x^-9)/(x-3)=0
(x+3)(x-3)/(x-3)=0
x+3=0
x=-3
3.
-1/2x+x^+p
x^-(1/2)x+p
(x-1/4)^
=x^-(1/2)x+1/16
p=1/16