Solve this quadratic equation by completing the square.
x2 + 6x = 18

x=3sqrt3-3; x=-3sqrt3-3

Step-by-step explanation:

solve for a, 2ax=6x; a=3:

x^2+6x+3^2=18+3^2

Simplify, 18+3^2=27:

x^2+6x+3^2=27

Complete square: (x+3)^2=27

Two answers: x+3=sqrt27; x+3=-sqrt27

Therefore, x=3sqrt3-3; x=-3sqrt3-3

it is b)

hope this : )

step-by-step explanation:

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations: