c^2+8c-9=-6

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Solution for c^2+8c-9=-6 equation:


Simplifying
c2 + 8c + -9 = -6

Reorder the terms:
-9 + 8c + c2 = -6

Solving
-9 + 8c + c2 = -6

Solving for variable 'c'.

Reorder the terms:
-9 + 6 + 8c + c2 = -6 + 6

Combine like terms: -9 + 6 = -3
-3 + 8c + c2 = -6 + 6

Combine like terms: -6 + 6 = 0
-3 + 8c + c2 = 0

Begin completing the square.

Move the constant term to the right:

Add '3' to each side of the equation.
-3 + 8c + 3 + c2 = 0 + 3

Reorder the terms:
-3 + 3 + 8c + c2 = 0 + 3

Combine like terms: -3 + 3 = 0
0 + 8c + c2 = 0 + 3
8c + c2 = 0 + 3

Combine like terms: 0 + 3 = 3
8c + c2 = 3

The c term is 8c.  Take half its coefficient (4).
Square it (16) and add it to both sides.

Add '16' to each side of the equation.
8c + 16 + c2 = 3 + 16

Reorder the terms:
16 + 8c + c2 = 3 + 16

Combine like terms: 3 + 16 = 19
16 + 8c + c2 = 19

Factor a perfect square on the left side:
(c + 4)(c + 4) = 19

Calculate the square root of the right side: 4.358898944

Break this problem into two subproblems by setting 
(c + 4) equal to 4.358898944 and -4.358898944.

Subproblem 1

c + 4 = 4.358898944 Simplifying c + 4 = 4.358898944 Reorder the terms: 4 + c = 4.358898944 Solving 4 + c = 4.358898944 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + c = 4.358898944 + -4 Combine like terms: 4 + -4 = 0 0 + c = 4.358898944 + -4 c = 4.358898944 + -4 Combine like terms: 4.358898944 + -4 = 0.358898944 c = 0.358898944 Simplifying c = 0.358898944

Subproblem 2

c + 4 = -4.358898944 Simplifying c + 4 = -4.358898944 Reorder the terms: 4 + c = -4.358898944 Solving 4 + c = -4.358898944 Solving for variable 'c'. Move all terms containing c to the left, all other terms to the right. Add '-4' to each side of the equation. 4 + -4 + c = -4.358898944 + -4 Combine like terms: 4 + -4 = 0 0 + c = -4.358898944 + -4 c = -4.358898944 + -4 Combine like terms: -4.358898944 + -4 = -8.358898944 c = -8.358898944 Simplifying c = -8.358898944

Solution

The solution to the problem is based on the solutions from the subproblems. c = {0.358898944, -8.358898944}

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