6x-8+x^2=90

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Solution for 6x-8+x^2=90 equation:


Simplifying
6x + -8 + x2 = 90

Reorder the terms:
-8 + 6x + x2 = 90

Solving
-8 + 6x + x2 = 90

Solving for variable 'x'.

Reorder the terms:
-8 + -90 + 6x + x2 = 90 + -90

Combine like terms: -8 + -90 = -98
-98 + 6x + x2 = 90 + -90

Combine like terms: 90 + -90 = 0
-98 + 6x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '98' to each side of the equation.
-98 + 6x + 98 + x2 = 0 + 98

Reorder the terms:
-98 + 98 + 6x + x2 = 0 + 98

Combine like terms: -98 + 98 = 0
0 + 6x + x2 = 0 + 98
6x + x2 = 0 + 98

Combine like terms: 0 + 98 = 98
6x + x2 = 98

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 98 + 9

Reorder the terms:
9 + 6x + x2 = 98 + 9

Combine like terms: 98 + 9 = 107
9 + 6x + x2 = 107

Factor a perfect square on the left side:
(x + 3)(x + 3) = 107

Calculate the square root of the right side: 10.344080433

Break this problem into two subproblems by setting 
(x + 3) equal to 10.344080433 and -10.344080433.

Subproblem 1

x + 3 = 10.344080433 Simplifying x + 3 = 10.344080433 Reorder the terms: 3 + x = 10.344080433 Solving 3 + x = 10.344080433 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 10.344080433 + -3 Combine like terms: 3 + -3 = 0 0 + x = 10.344080433 + -3 x = 10.344080433 + -3 Combine like terms: 10.344080433 + -3 = 7.344080433 x = 7.344080433 Simplifying x = 7.344080433

Subproblem 2

x + 3 = -10.344080433 Simplifying x + 3 = -10.344080433 Reorder the terms: 3 + x = -10.344080433 Solving 3 + x = -10.344080433 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -10.344080433 + -3 Combine like terms: 3 + -3 = 0 0 + x = -10.344080433 + -3 x = -10.344080433 + -3 Combine like terms: -10.344080433 + -3 = -13.344080433 x = -13.344080433 Simplifying x = -13.344080433

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.344080433, -13.344080433}

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