x^2+27x=400

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Solution for x^2+27x=400 equation:


Simplifying
x2 + 27x = 400

Reorder the terms:
27x + x2 = 400

Solving
27x + x2 = 400

Solving for variable 'x'.

Reorder the terms:
-400 + 27x + x2 = 400 + -400

Combine like terms: 400 + -400 = 0
-400 + 27x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '400' to each side of the equation.
-400 + 27x + 400 + x2 = 0 + 400

Reorder the terms:
-400 + 400 + 27x + x2 = 0 + 400

Combine like terms: -400 + 400 = 0
0 + 27x + x2 = 0 + 400
27x + x2 = 0 + 400

Combine like terms: 0 + 400 = 400
27x + x2 = 400

The x term is 27x.  Take half its coefficient (13.5).
Square it (182.25) and add it to both sides.

Add '182.25' to each side of the equation.
27x + 182.25 + x2 = 400 + 182.25

Reorder the terms:
182.25 + 27x + x2 = 400 + 182.25

Combine like terms: 400 + 182.25 = 582.25
182.25 + 27x + x2 = 582.25

Factor a perfect square on the left side:
(x + 13.5)(x + 13.5) = 582.25

Calculate the square root of the right side: 24.129857024

Break this problem into two subproblems by setting 
(x + 13.5) equal to 24.129857024 and -24.129857024.

Subproblem 1

x + 13.5 = 24.129857024 Simplifying x + 13.5 = 24.129857024 Reorder the terms: 13.5 + x = 24.129857024 Solving 13.5 + x = 24.129857024 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13.5' to each side of the equation. 13.5 + -13.5 + x = 24.129857024 + -13.5 Combine like terms: 13.5 + -13.5 = 0.0 0.0 + x = 24.129857024 + -13.5 x = 24.129857024 + -13.5 Combine like terms: 24.129857024 + -13.5 = 10.629857024 x = 10.629857024 Simplifying x = 10.629857024

Subproblem 2

x + 13.5 = -24.129857024 Simplifying x + 13.5 = -24.129857024 Reorder the terms: 13.5 + x = -24.129857024 Solving 13.5 + x = -24.129857024 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13.5' to each side of the equation. 13.5 + -13.5 + x = -24.129857024 + -13.5 Combine like terms: 13.5 + -13.5 = 0.0 0.0 + x = -24.129857024 + -13.5 x = -24.129857024 + -13.5 Combine like terms: -24.129857024 + -13.5 = -37.629857024 x = -37.629857024 Simplifying x = -37.629857024

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.629857024, -37.629857024}

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