2x^2-7=x^2-6x+16

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Solution for 2x^2-7=x^2-6x+16 equation:


Simplifying
2x2 + -7 = x2 + -6x + 16

Reorder the terms:
-7 + 2x2 = x2 + -6x + 16

Reorder the terms:
-7 + 2x2 = 16 + -6x + x2

Solving
-7 + 2x2 = 16 + -6x + x2

Solving for variable 'x'.

Reorder the terms:
-7 + -16 + 6x + 2x2 + -1x2 = 16 + -6x + x2 + -16 + 6x + -1x2

Combine like terms: -7 + -16 = -23
-23 + 6x + 2x2 + -1x2 = 16 + -6x + x2 + -16 + 6x + -1x2

Combine like terms: 2x2 + -1x2 = 1x2
-23 + 6x + 1x2 = 16 + -6x + x2 + -16 + 6x + -1x2

Reorder the terms:
-23 + 6x + 1x2 = 16 + -16 + -6x + 6x + x2 + -1x2

Combine like terms: 16 + -16 = 0
-23 + 6x + 1x2 = 0 + -6x + 6x + x2 + -1x2
-23 + 6x + 1x2 = -6x + 6x + x2 + -1x2

Combine like terms: -6x + 6x = 0
-23 + 6x + 1x2 = 0 + x2 + -1x2
-23 + 6x + 1x2 = x2 + -1x2

Combine like terms: x2 + -1x2 = 0
-23 + 6x + 1x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '23' to each side of the equation.
-23 + 6x + 23 + x2 = 0 + 23

Reorder the terms:
-23 + 23 + 6x + x2 = 0 + 23

Combine like terms: -23 + 23 = 0
0 + 6x + x2 = 0 + 23
6x + x2 = 0 + 23

Combine like terms: 0 + 23 = 23
6x + x2 = 23

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 = 23 + 9

Reorder the terms:
9 + 6x + x2 = 23 + 9

Combine like terms: 23 + 9 = 32
9 + 6x + x2 = 32

Factor a perfect square on the left side:
(x + 3)(x + 3) = 32

Calculate the square root of the right side: 5.656854249

Break this problem into two subproblems by setting 
(x + 3) equal to 5.656854249 and -5.656854249.

Subproblem 1

x + 3 = 5.656854249 Simplifying x + 3 = 5.656854249 Reorder the terms: 3 + x = 5.656854249 Solving 3 + x = 5.656854249 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 = 5.656854249 + -3 Combine like terms: 3 + -3 = 0 0 + x = 5.656854249 + -3 x = 5.656854249 + -3 Combine like terms: 5.656854249 + -3 = 2.656854249 x = 2.656854249 Simplifying x = 2.656854249

Subproblem 2

x + 3 = -5.656854249 Simplifying x + 3 = -5.656854249 Reorder the terms: 3 + x = -5.656854249 Solving 3 + x = -5.656854249 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 = -5.656854249 + -3 Combine like terms: 3 + -3 = 0 0 + x = -5.656854249 + -3 x = -5.656854249 + -3 Combine like terms: -5.656854249 + -3 = -8.656854249 x = -8.656854249 Simplifying x = -8.656854249

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.656854249, -8.656854249}

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