x^2=400-10x

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Solution for x^2=400-10x equation:


Simplifying
x2 = 400 + -10x

Solving
x2 = 400 + -10x

Solving for variable 'x'.

Reorder the terms:
-400 + 10x + x2 = 400 + -10x + -400 + 10x

Reorder the terms:
-400 + 10x + x2 = 400 + -400 + -10x + 10x

Combine like terms: 400 + -400 = 0
-400 + 10x + x2 = 0 + -10x + 10x
-400 + 10x + x2 = -10x + 10x

Combine like terms: -10x + 10x = 0
-400 + 10x + x2 = 0

Begin completing the square.

Move the constant term to the right:

Add '400' to each side of the equation.
-400 + 10x + 400 + x2 = 0 + 400

Reorder the terms:
-400 + 400 + 10x + x2 = 0 + 400

Combine like terms: -400 + 400 = 0
0 + 10x + x2 = 0 + 400
10x + x2 = 0 + 400

Combine like terms: 0 + 400 = 400
10x + x2 = 400

The x term is 10x.  Take half its coefficient (5).
Square it (25) and add it to both sides.

Add '25' to each side of the equation.
10x + 25 + x2 = 400 + 25

Reorder the terms:
25 + 10x + x2 = 400 + 25

Combine like terms: 400 + 25 = 425
25 + 10x + x2 = 425

Factor a perfect square on the left side:
(x + 5)(x + 5) = 425

Calculate the square root of the right side: 20.615528128

Break this problem into two subproblems by setting 
(x + 5) equal to 20.615528128 and -20.615528128.

Subproblem 1

x + 5 = 20.615528128 Simplifying x + 5 = 20.615528128 Reorder the terms: 5 + x = 20.615528128 Solving 5 + x = 20.615528128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = 20.615528128 + -5 Combine like terms: 5 + -5 = 0 0 + x = 20.615528128 + -5 x = 20.615528128 + -5 Combine like terms: 20.615528128 + -5 = 15.615528128 x = 15.615528128 Simplifying x = 15.615528128

Subproblem 2

x + 5 = -20.615528128 Simplifying x + 5 = -20.615528128 Reorder the terms: 5 + x = -20.615528128 Solving 5 + x = -20.615528128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + x = -20.615528128 + -5 Combine like terms: 5 + -5 = 0 0 + x = -20.615528128 + -5 x = -20.615528128 + -5 Combine like terms: -20.615528128 + -5 = -25.615528128 x = -25.615528128 Simplifying x = -25.615528128

Solution

The solution to the problem is based on the solutions from the subproblems. x = {15.615528128, -25.615528128}

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