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good morning Kingsley:  The question is asking you to find the value of x that makes the equation equal to zero. This is the same thing as asking where does the graph cross the x-axis.  
 
Since you have to parts (two things in parenthesis) set each equal to zero: 
x^2 -3 = 0  and solve for x. Remember when you take the square root of 3 you will have a positive and a negative answer!
 
x^2 +3 -4 = 0  and solve for x by factoring into two parts (x+4)(x-3) and set each of these equal to zero. 
 
Does that make sense?  
 
You will have four answers or four places the graph crosses the x-axis. 
Ms. J

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