x^2-16=2x^2-14x+21

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Solution for x^2-16=2x^2-14x+21 equation:


Simplifying
x2 + -16 = 2x2 + -14x + 21

Reorder the terms:
-16 + x2 = 2x2 + -14x + 21

Reorder the terms:
-16 + x2 = 21 + -14x + 2x2

Solving
-16 + x2 = 21 + -14x + 2x2

Solving for variable 'x'.

Reorder the terms:
-16 + -21 + 14x + x2 + -2x2 = 21 + -14x + 2x2 + -21 + 14x + -2x2

Combine like terms: -16 + -21 = -37
-37 + 14x + x2 + -2x2 = 21 + -14x + 2x2 + -21 + 14x + -2x2

Combine like terms: x2 + -2x2 = -1x2
-37 + 14x + -1x2 = 21 + -14x + 2x2 + -21 + 14x + -2x2

Reorder the terms:
-37 + 14x + -1x2 = 21 + -21 + -14x + 14x + 2x2 + -2x2

Combine like terms: 21 + -21 = 0
-37 + 14x + -1x2 = 0 + -14x + 14x + 2x2 + -2x2
-37 + 14x + -1x2 = -14x + 14x + 2x2 + -2x2

Combine like terms: -14x + 14x = 0
-37 + 14x + -1x2 = 0 + 2x2 + -2x2
-37 + 14x + -1x2 = 2x2 + -2x2

Combine like terms: 2x2 + -2x2 = 0
-37 + 14x + -1x2 = 0

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

Divide each side by '-1'.
37 + -14x + x2 = 0

Move the constant term to the right:

Add '-37' to each side of the equation.
37 + -14x + -37 + x2 = 0 + -37

Reorder the terms:
37 + -37 + -14x + x2 = 0 + -37

Combine like terms: 37 + -37 = 0
0 + -14x + x2 = 0 + -37
-14x + x2 = 0 + -37

Combine like terms: 0 + -37 = -37
-14x + x2 = -37

The x term is -14x.  Take half its coefficient (-7).
Square it (49) and add it to both sides.

Add '49' to each side of the equation.
-14x + 49 + x2 = -37 + 49

Reorder the terms:
49 + -14x + x2 = -37 + 49

Combine like terms: -37 + 49 = 12
49 + -14x + x2 = 12

Factor a perfect square on the left side:
(x + -7)(x + -7) = 12

Calculate the square root of the right side: 3.464101615

Break this problem into two subproblems by setting 
(x + -7) equal to 3.464101615 and -3.464101615.

Subproblem 1

x + -7 = 3.464101615 Simplifying x + -7 = 3.464101615 Reorder the terms: -7 + x = 3.464101615 Solving -7 + x = 3.464101615 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = 3.464101615 + 7 Combine like terms: -7 + 7 = 0 0 + x = 3.464101615 + 7 x = 3.464101615 + 7 Combine like terms: 3.464101615 + 7 = 10.464101615 x = 10.464101615 Simplifying x = 10.464101615

Subproblem 2

x + -7 = -3.464101615 Simplifying x + -7 = -3.464101615 Reorder the terms: -7 + x = -3.464101615 Solving -7 + x = -3.464101615 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '7' to each side of the equation. -7 + 7 + x = -3.464101615 + 7 Combine like terms: -7 + 7 = 0 0 + x = -3.464101615 + 7 x = -3.464101615 + 7 Combine like terms: -3.464101615 + 7 = 3.535898385 x = 3.535898385 Simplifying x = 3.535898385

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.464101615, 3.535898385}

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