Add 3 to both sides so that the equation becomes 2x^2 + 7x - 6 = 0. 
To find the solutions to this equation, we can apply the quadratic formula. This quadratic formula solves equations of the form ax^2 + bx + c = 0 
                              x = [ -b ± √(b^2 - 4ac) ] / (2a) 
                              x = [ -7 ± √(7^2 - 4(2)(-6)) ] / ( 2(2) ) 
                              x = [ -7 ± √(49 - (-48) ) ] / ( 4 ) 
                              x = [ -7 ± √(97) ] / ( 4) 
                              x = [ -7 ± sqrt(97) ] / ( 4 ) 
                              x = -7/4 ± sqrt(97)/4 
The answers are -7/4 + sqrt(97)/4 and -7/4 - sqrt(97)/4.
        
             
        
        
        
Answer:

Step-by-step explanation:
From the diagram, side length  is opposite to angle A and side length
 is opposite to angle A and side length  is adjacent  to angle A.
 is adjacent  to angle A.
Recall the mnemonics SOH CAH TOA.
We use TOA, because it involves opposite and adjacent.


The correct choice is A.
 
        
                    
             
        
        
        
Answer:
letter D
Step-by-step explanation:
hope this helps
 
        
                    
             
        
        
        
The expression cos240 degrees is equivalent to cos120 degrees