The only way to solve if it is equal to something
assuming that the teacher wanted you to make it equal to zero do
0=-3x^2-21x-54
remember if we can do
xy=0 then assume x and y=0
so factor
0=-3x^2-21x-54
undistribute the -3
0=-3(x^2+7x+18)
remember 0 times anything=0 so 
x^2+7x+18 must equal zero
use quadratice formula which is
if you have
ax^2+bx+c=0 then
x=

x^2+7x+18
a=1
b=7
c=18
x=

x=

x=

i=√-1
x=

the zerose would be
x=

 or 
 
 
        
        
        
Answer:
Square shaped = 27 cubic inches , Rectangular shaped = 3LW cubic Inches
Step-by-step explanation:
If the dictionary is a square ( all sides are equal ) the the volume is
       V = Length * Length * Length = 
       V = 3 * 3 * 3 = 27 
while if its rectangular ( all side are not equal ) shaped 
       V = Length * Width * Height (thickness)
       V = L * W * 3 = 3LW 
 
        
             
        
        
        
20/35 gallons per hour
(20/35) * 47 = around 27 gallons in 47 hours
        
             
        
        
        
First multiply them all by 8
2x - 1 = 7 + 4x
Subtract 2x
-1 = 7 + 2x
Subtract 7
-8 = 2x
Divide by 2
X = -4
        
             
        
        
        
Answer:
She will drive 272 miles in 4 hours.
Step-by-step explanation: