(x*x)-8x-47=49

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Solution for (x*x)-8x-47=49 equation:


Simplifying
(x * x) + -8x + -47 = 49

Multiply x * x
(x2) + -8x + -47 = 49
x2 + -8x + -47 = 49

Reorder the terms:
-47 + -8x + x2 = 49

Solving
-47 + -8x + x2 = 49

Solving for variable 'x'.

Reorder the terms:
-47 + -49 + -8x + x2 = 49 + -49

Combine like terms: -47 + -49 = -96
-96 + -8x + x2 = 49 + -49

Combine like terms: 49 + -49 = 0
-96 + -8x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '96' to each side of the equation.
-96 + -8x + 96 + x2 = 0 + 96

Reorder the terms:
-96 + 96 + -8x + x2 = 0 + 96

Combine like terms: -96 + 96 = 0
0 + -8x + x2 = 0 + 96
-8x + x2 = 0 + 96

Combine like terms: 0 + 96 = 96
-8x + x2 = 96

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

Add '16' to each side of the equation.
-8x + 16 + x2 = 96 + 16

Reorder the terms:
16 + -8x + x2 = 96 + 16

Combine like terms: 96 + 16 = 112
16 + -8x + x2 = 112

Factor a perfect square on the left side:
(x + -4)(x + -4) = 112

Calculate the square root of the right side: 10.583005244

Break this problem into two subproblems by setting 
(x + -4) equal to 10.583005244 and -10.583005244.

Subproblem 1

x + -4 = 10.583005244 Simplifying x + -4 = 10.583005244 Reorder the terms: -4 + x = 10.583005244 Solving -4 + x = 10.583005244 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = 10.583005244 + 4 Combine like terms: -4 + 4 = 0 0 + x = 10.583005244 + 4 x = 10.583005244 + 4 Combine like terms: 10.583005244 + 4 = 14.583005244 x = 14.583005244 Simplifying x = 14.583005244

Subproblem 2

x + -4 = -10.583005244 Simplifying x + -4 = -10.583005244 Reorder the terms: -4 + x = -10.583005244 Solving -4 + x = -10.583005244 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4' to each side of the equation. -4 + 4 + x = -10.583005244 + 4 Combine like terms: -4 + 4 = 0 0 + x = -10.583005244 + 4 x = -10.583005244 + 4 Combine like terms: -10.583005244 + 4 = -6.583005244 x = -6.583005244 Simplifying x = -6.583005244

Solution

The solution to the problem is based on the solutions from the subproblems. x = {14.583005244, -6.583005244}

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