First you must have the quadratic equal to zero. In order to do this you must subtract 7 to both sides
x^2 + 20x + (100 - 7) = 7 - 7
x^2 + 20x + 93 = 0
Now you must find two numbers who's sum equals 20 and their multiplication equal 93
Are there any? NO!
This means that you have to use the formula:

In this case:
a = 1
b = 20
c = 93



^^^We must simplify √28
√28 = 2√7
so...

simplify further:

-10 + √7
or
-10 - √7
***plus/minus = ±
Hope this helped!
~Just a girl in love with Shawn Mendes
 
        
             
        
        
        
Answer:
248
Step-by-step explanation:
(62)4
= 62 x 4
= 248
 
        
             
        
        
        
Answer:
80 is 50% of 160.
Step-by-step explanation:
In order to find this, we take the whole number and divide by the percentage that it represents. This gives us the number we are looking for. 
80/50%
80/.50
160
 
        
                    
             
        
        
        
Answer:
175 is the answer
Step-by-step explanation:



 
        
             
        
        
        
Answer:
317
Step-by-step explanation:
I did this on khan academy