Step-by-step explanation:
Bc is also 20 answer is 400
 
        
             
        
        
        
Answer:
v
x
5
−
2
v
x
4
−
8
x
4
+
3
v
x
3
+
24
x
3
−
4
v
x
2
−
40
x
2
+
v
x
+
56
x
+
8
x
−
40
v
x
5
-
2
v
x
4
-
8
x
4
+
3
v
x
3
+
24
x
3
-
4
v
x
2
-
40
x
2
+
v
x
+
56
x
+
8
x
-
40
 
Step-by-step explanation:
 
        
                    
             
        
        
        
Y = f(3f - 4g + 3) +7g(3f - 4g + 3)
 = 3f^2 - 4fg + 3f + 21fg - 28g^2 + 21g
 = 3f^2 + 3f + 17fg + 21g - 28g^2
        
             
        
        
        
You would simply have to plug in, or substitute, the given values in the equations.
So, H=-5, W=2 and the problem is 4h-3w
To plug them in, your new equation would be 4(-5)-3(2) and simplify. So it becomes -20-6 which = -26. 
And -26 would be your answer.