Solve by completing the square. Show all work you use to arrive at your answer.
x² + 6x = 81

x = - 3 ± 3

Step-by-step explanation:

x² + 6x = 81

To complete the square

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

x² + 2(3)x + 9 = 81 + 9

(x + 3)² = 90 ( take square root of both sides )

x + 3 = ± = ± 3 ( subtract 3 from both sides )

x = - 3 ± 3 , then

x = - 3 - 3 , x = - 3 + 3

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step-by-step explanation:

use that smart brain

x = 17

step-by-step explanation:

1st step: isolate x.

24 - 3x = -27

-24         -24

-3x   =   -51

2nd step: divide.

-3x     =   -51

  3             3

  x       =     17

hope this