Question 159218
x-3+5=0  simplify to get x+2=0 subtract 2 from both sides and get x=-2

replace each x with -2. When you square a -number the result is positive. 

2(-2)^2=3y^2+5      8=3y^2+5 

Subtract 5 from both side and you get 3=3y^2

Divide both sides by 3
1=y^2 y =1 or -1.