(10x)-(0.01x^2+0.4x+20)=

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Solution for (10x)-(0.01x^2+0.4x+20)= equation:


Simplifying
(10x) + -1(0.01x2 + 0.4x + 20) = 0

Reorder the terms:
(10x) + -1(20 + 0.4x + 0.01x2) = 0
(10x) + (20 * -1 + 0.4x * -1 + 0.01x2 * -1) = 0
(10x) + (-20 + -0.4x + -0.01x2) = 0

Reorder the terms:
-20 + (10x) + -0.4x + -0.01x2 = 0

Combine like terms: (10x) + -0.4x = 9.6x
-20 + 9.6x + -0.01x2 = 0

Solving
-20 + 9.6x + -0.01x2 = 0

Solving for variable 'x'.

Begin completing the square.  Divide all terms by
-0.01 the coefficient of the squared term: 

Divide each side by '-0.01'.
2000 + -960x + x2 = 0

Move the constant term to the right:

Add '-2000' to each side of the equation.
2000 + -960x + -2000 + x2 = 0 + -2000

Reorder the terms:
2000 + -2000 + -960x + x2 = 0 + -2000

Combine like terms: 2000 + -2000 = 0
0 + -960x + x2 = 0 + -2000
-960x + x2 = 0 + -2000

Combine like terms: 0 + -2000 = -2000
-960x + x2 = -2000

The x term is -960x.  Take half its coefficient (-480).
Square it (230400) and add it to both sides.

Add '230400' to each side of the equation.
-960x + 230400 + x2 = -2000 + 230400

Reorder the terms:
230400 + -960x + x2 = -2000 + 230400

Combine like terms: -2000 + 230400 = 228400
230400 + -960x + x2 = 228400

Factor a perfect square on the left side:
(x + -480)(x + -480) = 228400

Calculate the square root of the right side: 477.912125814

Break this problem into two subproblems by setting 
(x + -480) equal to 477.912125814 and -477.912125814.

Subproblem 1

x + -480 = 477.912125814 Simplifying x + -480 = 477.912125814 Reorder the terms: -480 + x = 477.912125814 Solving -480 + x = 477.912125814 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '480' to each side of the equation. -480 + 480 + x = 477.912125814 + 480 Combine like terms: -480 + 480 = 0 0 + x = 477.912125814 + 480 x = 477.912125814 + 480 Combine like terms: 477.912125814 + 480 = 957.912125814 x = 957.912125814 Simplifying x = 957.912125814

Subproblem 2

x + -480 = -477.912125814 Simplifying x + -480 = -477.912125814 Reorder the terms: -480 + x = -477.912125814 Solving -480 + x = -477.912125814 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '480' to each side of the equation. -480 + 480 + x = -477.912125814 + 480 Combine like terms: -480 + 480 = 0 0 + x = -477.912125814 + 480 x = -477.912125814 + 480 Combine like terms: -477.912125814 + 480 = 2.087874186 x = 2.087874186 Simplifying x = 2.087874186

Solution

The solution to the problem is based on the solutions from the subproblems. x = {957.912125814, 2.087874186}

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