f(x) = 20x² - 18x - 25
f(-1) = 20(-1)² - 18(-1) - 25
 = 20 + 18 - 25
 = 13
 
        
             
        
        
        
Correct answer: the first choice !
        
             
        
        
        
If you would do this in whole number form, it'll be 40/7. 
 
        
                    
             
        
        
        
Answer: LHS = RHS
Step-by-step explanation: 
Heya!!
Here, we need to compare the LHS and RHS
So, here is the solution -
(9p-5q)²+ 180 pq = (9p+5q)
LHS
= (9p-5q)²+ 180 pq
= 81 p² + 25 q² + 90 pq + 180 pq
= (9p - 5q) ²
RHS = (9p - 5q) ²
Hence, proved => LHS = RHS
Hope it helps!
 
        
                    
             
        
        
        
Answer:
18 21 24 24 =87 maybe trying to help