Answer: 
 
Step-by-step explanation:
A perfect square trinomial is written as 
, where
 first term 
 = square of first term of binomial
second term=
=twice the product of both terms of binomial.
and third term 'c'=square of last term of binomial
Thus to create a perfect  square trinomial put 'a' and 'c' a square number
Let a=4 and c=9
The required trinomial will be 

![=(2x)^2+2(2x)(3)+3^2\\=(2x+3)^2.......\text{[using pattern}(a+b)^2=a^2+2ab+b^2]\\=(2x+3)(2x+3)](https://tex.z-dn.net/?f=%3D%282x%29%5E2%2B2%282x%29%283%29%2B3%5E2%5C%5C%3D%282x%2B3%29%5E2.......%5Ctext%7B%5Busing%20pattern%7D%28a%2Bb%29%5E2%3Da%5E2%2B2ab%2Bb%5E2%5D%5C%5C%3D%282x%2B3%29%282x%2B3%29)
 
        
                    
             
        
        
        
Answer:
5398
Step-by-step explanation:
7715-2212+10-(5x23)
7715-2212+10-115
5503+10-115
5513-115
5398
 
        
             
        
        
        
Hey there!
You can tell that the two angles are congruent because of the arc. So make the two angles each other. 
3x-17=25-3x. Add 3x to each side. You get 6x-17=25. Add 17 to each side to get 6x=42. Divide each side by 6. You get x=7. So the value of x would be 7. 
I hope this helps!