Please:  Use "^" to denote exponentiation:  <span>2x^2 + 8x - 12 = 0
Reduce this by div. every term by 2:             </span><span>x^2 + 4x - 6 = 0
Here a=1, b=4 and c = -6.  Square half of b, obtaining (4/2)^2 = 4, and add, and then subtract, this 4 to x^2 + 4x - 6:
</span> x^2 + 4x +4  - 4 - 6 = 0.  Rewrite the square as (x+2)^2, obtaining new equation
(x+2)^2 = 10.  Take the sqrt of both sides:   x+2 = plus or minus sqrt(10).
Finally, solve for x:  x = -2 plus or minus sqrt(10).
        
             
        
        
        
Answer:
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Answer:
Step-by-step explanation:
hello:
D. (9,13) because when x=9   so y=9+4 = 13.....(right)
 
        
                    
             
        
        
        
Answer:
c
Step-by-step explanation:
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Answer:

Step-by-step explanation:
Use a cofunction identity on the right hand side or left hand side...
So  .
.
We have the equation:

Make the above replacement:

Since cotangent has period 180 degrees, we can also write this as:

So solving the following will give us a set of solutions for  :
:

Add  on both sides:
 on both sides:

Subtract 10 on both sides:

Divide both sides by 2:

Symmetric property:
