Solve x²-4x-1=0 in the form a+-square root b

x = 2 ±

Step-by-step explanation:

Given

x² - 4x - 1 = 0 ( add 1 to both sides )

x² - 4x = 1

Using the method of completing the square

Add ( half the coefficient of the x- term )² to both sides

x² + 2(- 2) x + 4 = 1 + 4

(x - 2)² = 5 ( take the square root of both sides )

x - 2 = ± ( add 2 to both sides )

x = 2 ±

step-by-step explanation:

rectangles are made up of 4 right angles, which means that a side and a base meet perpendicular to one another.   their slopes then have to reflect perpendicular slopes.   perpendicular slopes are opposite reciprocals of one another.   for example, if the slope of one line is +2/3, then the perpendicular slope to that would be -3/2.   so we look for that combination in our choices.

all of them satisfy that condition (so what's the question, i guess? )

what are your