Will give brainliest solve x2 + 4x − 4 = 0. x equals the quantity of negative 2 plus or minus square root 16 all over 2 x equals negative 4 plus or minus square root 2 x equals negative 2 plus or minus 2 square root 2 x equals the quantity of 4 plus or minus square root 18 all over 2

ANSWER

EXPLANATION

Given:

We complete the square as follows;

Add 4 to both sides of the equation:

Add half the coefficient of to both sides of the equation.

The Left Hand Side of the equation is now a perfect square.

Take the square root of both sides

Hence the correct answer is option C

Given equation is

compare with

we get: a=1, b=4, c=-4

plug these values into quadratic formula:

Hence finall answer is:

and

9 sandwiches per hour

step-by-step explanation:

when we have a rate, we want a 1 in the denominator

27/3 = 9

27 sandwiches/ 3 hours = 9 sandwiches/hour