Answer:
a. x = 2 , x = -5
b. no real roots
Step-by-step explanation:
<u>a. x² + 3x – 10</u>
= x² - 2x + 5x - 10
= x (x²/x - 2x/x) + 5 (5x/5 - 2*5/5)
= (x - 2) (x + 5)
x - 2 = 0                            x + 5 = 0
  + 2    +2                             -5     -5
--------------                         ---------------
x = 2                                   x = -5
x = 2 , x = -5
<u>b. 2x² - 4x + 3 </u>
This can't be solved because the equation has no real roots, and also the discriminant is negative. 
 
        
             
        
        
        
Step-by-step explanation:
First, the pizza is 18 inches in diameter, so 

and, because the radium is half of the diameter,

<u>Note that the units are inches.</u>
Using the equation 

where a is the area of a circle, we know that the area of the whole pizza is approx.254.5 square inches. Divide by 8 to find the area of 1/8 of a pizza. Each slice will have an area of approx. 32 square inches. For a precise result, the answer is 

where a(s) is the area of a slice of pizza, and s is the total number of slices, given they are equal in size.
 
        
             
        
        
        
Answer:
Step-by-step explanation:
<u><em>h. -1</em></u>
<u><em>i. 5</em></u>
<u><em>j. 11</em></u>
<u><em>k. -3</em></u>
<u><em>l. 1</em></u>
<u><em></em></u>
<u><em>Hope it helps.</em></u>