x^2-16x=51

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Solution for x^2-16x=51 equation:


Simplifying
x2 + -16x = 51

Reorder the terms:
-16x + x2 = 51

Solving
-16x + x2 = 51

Solving for variable 'x'.

Reorder the terms:
-51 + -16x + x2 = 51 + -51

Combine like terms: 51 + -51 = 0
-51 + -16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '51' to each side of the equation.
-51 + -16x + 51 + x2 = 0 + 51

Reorder the terms:
-51 + 51 + -16x + x2 = 0 + 51

Combine like terms: -51 + 51 = 0
0 + -16x + x2 = 0 + 51
-16x + x2 = 0 + 51

Combine like terms: 0 + 51 = 51
-16x + x2 = 51

The x term is -16x.  Take half its coefficient (-8).
Square it (64) and add it to both sides.

Add '64' to each side of the equation.
-16x + 64 + x2 = 51 + 64

Reorder the terms:
64 + -16x + x2 = 51 + 64

Combine like terms: 51 + 64 = 115
64 + -16x + x2 = 115

Factor a perfect square on the left side:
(x + -8)(x + -8) = 115

Calculate the square root of the right side: 10.723805295

Break this problem into two subproblems by setting 
(x + -8) equal to 10.723805295 and -10.723805295.

Subproblem 1

x + -8 = 10.723805295 Simplifying x + -8 = 10.723805295 Reorder the terms: -8 + x = 10.723805295 Solving -8 + x = 10.723805295 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = 10.723805295 + 8 Combine like terms: -8 + 8 = 0 0 + x = 10.723805295 + 8 x = 10.723805295 + 8 Combine like terms: 10.723805295 + 8 = 18.723805295 x = 18.723805295 Simplifying x = 18.723805295

Subproblem 2

x + -8 = -10.723805295 Simplifying x + -8 = -10.723805295 Reorder the terms: -8 + x = -10.723805295 Solving -8 + x = -10.723805295 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + x = -10.723805295 + 8 Combine like terms: -8 + 8 = 0 0 + x = -10.723805295 + 8 x = -10.723805295 + 8 Combine like terms: -10.723805295 + 8 = -2.723805295 x = -2.723805295 Simplifying x = -2.723805295

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.723805295, -2.723805295}

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