x^2=16x+9

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Solution for x^2=16x+9 equation:


Simplifying
x2 = 16x + 9

Reorder the terms:
x2 = 9 + 16x

Solving
x2 = 9 + 16x

Solving for variable 'x'.

Reorder the terms:
-9 + -16x + x2 = 9 + 16x + -9 + -16x

Reorder the terms:
-9 + -16x + x2 = 9 + -9 + 16x + -16x

Combine like terms: 9 + -9 = 0
-9 + -16x + x2 = 0 + 16x + -16x
-9 + -16x + x2 = 16x + -16x

Combine like terms: 16x + -16x = 0
-9 + -16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + -16x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + -16x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + -16x + x2 = 0 + 9
-16x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
-16x + x2 = 9

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 = 9 + 64

Reorder the terms:
64 + -16x + x2 = 9 + 64

Combine like terms: 9 + 64 = 73
64 + -16x + x2 = 73

Factor a perfect square on the left side:
(x + -8)(x + -8) = 73

Calculate the square root of the right side: 8.544003745

Break this problem into two subproblems by setting 
(x + -8) equal to 8.544003745 and -8.544003745.

Subproblem 1

x + -8 = 8.544003745 Simplifying x + -8 = 8.544003745 Reorder the terms: -8 + x = 8.544003745 Solving -8 + x = 8.544003745 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 = 8.544003745 + 8 Combine like terms: -8 + 8 = 0 0 + x = 8.544003745 + 8 x = 8.544003745 + 8 Combine like terms: 8.544003745 + 8 = 16.544003745 x = 16.544003745 Simplifying x = 16.544003745

Subproblem 2

x + -8 = -8.544003745 Simplifying x + -8 = -8.544003745 Reorder the terms: -8 + x = -8.544003745 Solving -8 + x = -8.544003745 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 = -8.544003745 + 8 Combine like terms: -8 + 8 = 0 0 + x = -8.544003745 + 8 x = -8.544003745 + 8 Combine like terms: -8.544003745 + 8 = -0.544003745 x = -0.544003745 Simplifying x = -0.544003745

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.544003745, -0.544003745}

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