Trish is correct because whatever number starts the tree equals 48 anyway. The numbers that matters is if you follow through when factoring out the whole tree of 48.
        
                    
             
        
        
        
True multiply both sides by 15
        
             
        
        
        
Answer:
y = -  (x - 5)² + 7
 (x - 5)² + 7
Step-by-step explanation:
The equation of a quadratic in vertex form is
y = a(x - h)² + k
where (h, k ) are the coordinates of the vertex and a is a multiplier
Here (h, k ) = (5, 7 ) , then
y = a(x - 5)² + 7
To find a substitute (10, - 3 ) into the equation
- 3 = a(10 - 5)² + 7 ( subtract 7 from both sides )
- 10 = 5²a = 25a ( divide both sides by 25 )
 = a , that is
 = a , that is
a = - 
y = -  (x - 5)² + 7 ← in vertex form
 (x - 5)² + 7 ← in vertex form
 
        
             
        
        
        
Answer:
both angles are the same, so you can use it interchangeably in proving.
But i suggest you to mantain only one, because it's easier to understand and it looks better.