Rodrigo needs to solve the equation x2 – 4x – 18 = 0 by completing the square. Which pair of steps is the most efficient way to begin?

A. x2 – 4x = 18
x2 – 4x + 2 = 18 + 2

B. x2 – 4x = 18
x2 – 4x + 4 = 18 + 4

C. x2 – 4x = 18
x2 – 4x + 81 = 18 + 81

D. x2 – 4x = 18
x2 – 4x + 16 = 18 + 16

B.x2-4x=18

x2-4x+4=18+4

Step-by-step explanation:

When you complete the square your quadratic equation must be written in the standard form which is ax^2+bx+c.

First you are going to want to move your c term to the right (in this case move -18 to the right by adding 18 to both sides). This will get you x^2-4x=18. Now you are going to need to complete the square. To complete the square you divide the number in the bx term (in this case -4) by 2 and then square it. (-2^2=4 since a negative times a negative equals a positive). Now that you have 4 you are going to add it to both sides to get x2-4x+4=18+4.

c

step-by-step explanation:

it would be see because your formula is f(x)=6x, so 6 times 1 is 6 and you go on and the best answer is c.

i believe the correct answer is option 4.principalities were small territories that were run by russian rulers.

which statement correctly defines principalities in northern asia in the 1200s? principalities were small territories that were run by russian rulers.

hope i could ! : )