16x+8=x^2-2x-3

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Solution for 16x+8=x^2-2x-3 equation:


Simplifying
16x + 8 = x2 + -2x + -3

Reorder the terms:
8 + 16x = x2 + -2x + -3

Reorder the terms:
8 + 16x = -3 + -2x + x2

Solving
8 + 16x = -3 + -2x + x2

Solving for variable 'x'.

Reorder the terms:
8 + 3 + 16x + 2x + -1x2 = -3 + -2x + x2 + 3 + 2x + -1x2

Combine like terms: 8 + 3 = 11
11 + 16x + 2x + -1x2 = -3 + -2x + x2 + 3 + 2x + -1x2

Combine like terms: 16x + 2x = 18x
11 + 18x + -1x2 = -3 + -2x + x2 + 3 + 2x + -1x2

Reorder the terms:
11 + 18x + -1x2 = -3 + 3 + -2x + 2x + x2 + -1x2

Combine like terms: -3 + 3 = 0
11 + 18x + -1x2 = 0 + -2x + 2x + x2 + -1x2
11 + 18x + -1x2 = -2x + 2x + x2 + -1x2

Combine like terms: -2x + 2x = 0
11 + 18x + -1x2 = 0 + x2 + -1x2
11 + 18x + -1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
11 + 18x + -1x2 = 0

Begin completing the square.  Divide all terms by
-1 the coefficient of the squared term: 

Divide each side by '-1'.
-11 + -18x + x2 = 0

Move the constant term to the right:

Add '11' to each side of the equation.
-11 + -18x + 11 + x2 = 0 + 11

Reorder the terms:
-11 + 11 + -18x + x2 = 0 + 11

Combine like terms: -11 + 11 = 0
0 + -18x + x2 = 0 + 11
-18x + x2 = 0 + 11

Combine like terms: 0 + 11 = 11
-18x + x2 = 11

The x term is -18x.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x + 81 + x2 = 11 + 81

Reorder the terms:
81 + -18x + x2 = 11 + 81

Combine like terms: 11 + 81 = 92
81 + -18x + x2 = 92

Factor a perfect square on the left side:
(x + -9)(x + -9) = 92

Calculate the square root of the right side: 9.591663047

Break this problem into two subproblems by setting 
(x + -9) equal to 9.591663047 and -9.591663047.

Subproblem 1

x + -9 = 9.591663047 Simplifying x + -9 = 9.591663047 Reorder the terms: -9 + x = 9.591663047 Solving -9 + x = 9.591663047 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 9.591663047 + 9 Combine like terms: -9 + 9 = 0 0 + x = 9.591663047 + 9 x = 9.591663047 + 9 Combine like terms: 9.591663047 + 9 = 18.591663047 x = 18.591663047 Simplifying x = 18.591663047

Subproblem 2

x + -9 = -9.591663047 Simplifying x + -9 = -9.591663047 Reorder the terms: -9 + x = -9.591663047 Solving -9 + x = -9.591663047 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = -9.591663047 + 9 Combine like terms: -9 + 9 = 0 0 + x = -9.591663047 + 9 x = -9.591663047 + 9 Combine like terms: -9.591663047 + 9 = -0.591663047 x = -0.591663047 Simplifying x = -0.591663047

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.591663047, -0.591663047}

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