16x+x^2=400

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Solution for 16x+x^2=400 equation:


Simplifying
16x + x2 = 400

Solving
16x + x2 = 400

Solving for variable 'x'.

Reorder the terms:
-400 + 16x + x2 = 400 + -400

Combine like terms: 400 + -400 = 0
-400 + 16x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '400' to each side of the equation.
-400 + 16x + 400 + x2 = 0 + 400

Reorder the terms:
-400 + 400 + 16x + x2 = 0 + 400

Combine like terms: -400 + 400 = 0
0 + 16x + x2 = 0 + 400
16x + x2 = 0 + 400

Combine like terms: 0 + 400 = 400
16x + x2 = 400

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 = 400 + 64

Reorder the terms:
64 + 16x + x2 = 400 + 64

Combine like terms: 400 + 64 = 464
64 + 16x + x2 = 464

Factor a perfect square on the left side:
(x + 8)(x + 8) = 464

Calculate the square root of the right side: 21.540659229

Break this problem into two subproblems by setting 
(x + 8) equal to 21.540659229 and -21.540659229.

Subproblem 1

x + 8 = 21.540659229 Simplifying x + 8 = 21.540659229 Reorder the terms: 8 + x = 21.540659229 Solving 8 + x = 21.540659229 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 = 21.540659229 + -8 Combine like terms: 8 + -8 = 0 0 + x = 21.540659229 + -8 x = 21.540659229 + -8 Combine like terms: 21.540659229 + -8 = 13.540659229 x = 13.540659229 Simplifying x = 13.540659229

Subproblem 2

x + 8 = -21.540659229 Simplifying x + 8 = -21.540659229 Reorder the terms: 8 + x = -21.540659229 Solving 8 + x = -21.540659229 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 = -21.540659229 + -8 Combine like terms: 8 + -8 = 0 0 + x = -21.540659229 + -8 x = -21.540659229 + -8 Combine like terms: -21.540659229 + -8 = -29.540659229 x = -29.540659229 Simplifying x = -29.540659229

Solution

The solution to the problem is based on the solutions from the subproblems. x = {13.540659229, -29.540659229}

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