X^2 + 4x - 7x = 0
GIVE YOUR ANSWER TO THE CORRECT 2 DECIMAL PLACES

x ≈ - 5.32, x ≈ 1.32

Step-by-step explanation:

x² + 4x - 7 = 0 ( add 7 to both sides )

x² + 4x = 7

To complete the square

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

x² + 2(2)x + 4 = 7 + 4

(x + 2)² = 11 ( take the square root of both sides )

x + 2 = ± ( subtract 2 from both sides )

x = - 2 ±

Thus

x = - 2 - ≈ - 5.32 ( to 2 dec. places )

x = - 2 + ≈ 1.32 ( to 2 dec. places )

x = -5.32, x = 1.32

Step-by-step explanation:

Ok. So to use the Complete the Square method, you divide the middle value by 2 and then square the number you get. This will give:

     (now factor the left side)

      (now square root both sides)

        (+/- = plus or minus)

x = -5.32, x = 1.32

54.864 meters

step-by-step explanation:

b, i believe, but not sure.