x^2-16=5x

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Solution for x^2-16=5x equation:


Simplifying
x2 + -16 = 5x

Reorder the terms:
-16 + x2 = 5x

Solving
-16 + x2 = 5x

Solving for variable 'x'.

Reorder the terms:
-16 + -5x + x2 = 5x + -5x

Combine like terms: 5x + -5x = 0
-16 + -5x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '16' to each side of the equation.
-16 + -5x + 16 + x2 = 0 + 16

Reorder the terms:
-16 + 16 + -5x + x2 = 0 + 16

Combine like terms: -16 + 16 = 0
0 + -5x + x2 = 0 + 16
-5x + x2 = 0 + 16

Combine like terms: 0 + 16 = 16
-5x + x2 = 16

The x term is -5x.  Take half its coefficient (-2.5).
Square it (6.25) and add it to both sides.

Add '6.25' to each side of the equation.
-5x + 6.25 + x2 = 16 + 6.25

Reorder the terms:
6.25 + -5x + x2 = 16 + 6.25

Combine like terms: 16 + 6.25 = 22.25
6.25 + -5x + x2 = 22.25

Factor a perfect square on the left side:
(x + -2.5)(x + -2.5) = 22.25

Calculate the square root of the right side: 4.716990566

Break this problem into two subproblems by setting 
(x + -2.5) equal to 4.716990566 and -4.716990566.

Subproblem 1

x + -2.5 = 4.716990566 Simplifying x + -2.5 = 4.716990566 Reorder the terms: -2.5 + x = 4.716990566 Solving -2.5 + x = 4.716990566 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = 4.716990566 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = 4.716990566 + 2.5 x = 4.716990566 + 2.5 Combine like terms: 4.716990566 + 2.5 = 7.216990566 x = 7.216990566 Simplifying x = 7.216990566

Subproblem 2

x + -2.5 = -4.716990566 Simplifying x + -2.5 = -4.716990566 Reorder the terms: -2.5 + x = -4.716990566 Solving -2.5 + x = -4.716990566 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2.5' to each side of the equation. -2.5 + 2.5 + x = -4.716990566 + 2.5 Combine like terms: -2.5 + 2.5 = 0.0 0.0 + x = -4.716990566 + 2.5 x = -4.716990566 + 2.5 Combine like terms: -4.716990566 + 2.5 = -2.216990566 x = -2.216990566 Simplifying x = -2.216990566

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.216990566, -2.216990566}

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