40x^2+x=1000000

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Solution for 40x^2+x=1000000 equation:


Simplifying
40x2 + x = 1000000

Reorder the terms:
x + 40x2 = 1000000

Solving
x + 40x2 = 1000000

Solving for variable 'x'.

Reorder the terms:
-1000000 + x + 40x2 = 1000000 + -1000000

Combine like terms: 1000000 + -1000000 = 0
-1000000 + x + 40x2 = 0

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

Divide each side by '40'.
-25000 + 0.025x + x2 = 0

Move the constant term to the right:

Add '25000' to each side of the equation.
-25000 + 0.025x + 25000 + x2 = 0 + 25000

Reorder the terms:
-25000 + 25000 + 0.025x + x2 = 0 + 25000

Combine like terms: -25000 + 25000 = 0
0 + 0.025x + x2 = 0 + 25000
0.025x + x2 = 0 + 25000

Combine like terms: 0 + 25000 = 25000
0.025x + x2 = 25000

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.025x + 0.25 + x2 = 25000 + 0.25

Reorder the terms:
0.25 + 0.025x + x2 = 25000 + 0.25

Combine like terms: 25000 + 0.25 = 25000.25
0.25 + 0.025x + x2 = 25000.25

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 25000.25

Calculate the square root of the right side: 158.114673576

Break this problem into two subproblems by setting 
(x + 0.5) equal to 158.114673576 and -158.114673576.

Subproblem 1

x + 0.5 = 158.114673576 Simplifying x + 0.5 = 158.114673576 Reorder the terms: 0.5 + x = 158.114673576 Solving 0.5 + x = 158.114673576 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 158.114673576 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 158.114673576 + -0.5 x = 158.114673576 + -0.5 Combine like terms: 158.114673576 + -0.5 = 157.614673576 x = 157.614673576 Simplifying x = 157.614673576

Subproblem 2

x + 0.5 = -158.114673576 Simplifying x + 0.5 = -158.114673576 Reorder the terms: 0.5 + x = -158.114673576 Solving 0.5 + x = -158.114673576 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -158.114673576 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -158.114673576 + -0.5 x = -158.114673576 + -0.5 Combine like terms: -158.114673576 + -0.5 = -158.614673576 x = -158.614673576 Simplifying x = -158.614673576

Solution

The solution to the problem is based on the solutions from the subproblems. x = {157.614673576, -158.614673576}

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