X^2+14x-15=0 solve by completing the square

To complete the square we:

• take the coefficient of X

• divide it by 2

• square that number

• then add it to both sides of the equation.

coefficient of x = 14

14 ÷ 2 = 7 then squaring it equals 49

X^2 +14x + 49 = 15 + 49

(x+7) * (x+7) = 64 then taking the square root of both sides:

x + 7 = 8 AND x + 7 = -8

x = 1 and x = -15

to plot points   for x just start at the origin (middle) and go to the left however many times it say(if the number is a positive) if the number is a negative then go right however many times it says if it is 0 go nowhere

now keep you pencil there and go up however many times it says on y(if it is positive) if it is negative then go down however many times it says. if it says 0 go nowhere.

you have just plotted a point! now when you finish plotting all of them connect them with a ruler

plot each point as (-3, 7), (0,4), (3,1), (8,-4)   in the parenthesis on the left of the comma is x and the right is y.