x^2-40x=9.6

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Solution for x^2-40x=9.6 equation:


Simplifying
x2 + -40x = 9.6

Reorder the terms:
-40x + x2 = 9.6

Solving
-40x + x2 = 9.6

Solving for variable 'x'.

Reorder the terms:
-9.6 + -40x + x2 = 9.6 + -9.6

Combine like terms: 9.6 + -9.6 = 0.0
-9.6 + -40x + x2 = 0.0

Begin completing the square.

Move the constant term to the right:

Add '9.6' to each side of the equation.
-9.6 + -40x + 9.6 + x2 = 0.0 + 9.6

Reorder the terms:
-9.6 + 9.6 + -40x + x2 = 0.0 + 9.6

Combine like terms: -9.6 + 9.6 = 0.0
0.0 + -40x + x2 = 0.0 + 9.6
-40x + x2 = 0.0 + 9.6

Combine like terms: 0.0 + 9.6 = 9.6
-40x + x2 = 9.6

The x term is -40x.  Take half its coefficient (-20).
Square it (400) and add it to both sides.

Add '400' to each side of the equation.
-40x + 400 + x2 = 9.6 + 400

Reorder the terms:
400 + -40x + x2 = 9.6 + 400

Combine like terms: 9.6 + 400 = 409.6
400 + -40x + x2 = 409.6

Factor a perfect square on the left side:
(x + -20)(x + -20) = 409.6

Calculate the square root of the right side: 20.238577025

Break this problem into two subproblems by setting 
(x + -20) equal to 20.238577025 and -20.238577025.

Subproblem 1

x + -20 = 20.238577025 Simplifying x + -20 = 20.238577025 Reorder the terms: -20 + x = 20.238577025 Solving -20 + x = 20.238577025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = 20.238577025 + 20 Combine like terms: -20 + 20 = 0 0 + x = 20.238577025 + 20 x = 20.238577025 + 20 Combine like terms: 20.238577025 + 20 = 40.238577025 x = 40.238577025 Simplifying x = 40.238577025

Subproblem 2

x + -20 = -20.238577025 Simplifying x + -20 = -20.238577025 Reorder the terms: -20 + x = -20.238577025 Solving -20 + x = -20.238577025 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '20' to each side of the equation. -20 + 20 + x = -20.238577025 + 20 Combine like terms: -20 + 20 = 0 0 + x = -20.238577025 + 20 x = -20.238577025 + 20 Combine like terms: -20.238577025 + 20 = -0.238577025 x = -0.238577025 Simplifying x = -0.238577025

Solution

The solution to the problem is based on the solutions from the subproblems. x = {40.238577025, -0.238577025}

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