1=4x^2-40x

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Solution for 1=4x^2-40x equation:


Simplifying
1 = 4x2 + -40x

Reorder the terms:
1 = -40x + 4x2

Solving
1 = -40x + 4x2

Solving for variable 'x'.

Reorder the terms:
1 + 40x + -4x2 = -40x + 40x + 4x2 + -4x2

Combine like terms: -40x + 40x = 0
1 + 40x + -4x2 = 0 + 4x2 + -4x2
1 + 40x + -4x2 = 4x2 + -4x2

Combine like terms: 4x2 + -4x2 = 0
1 + 40x + -4x2 = 0

Begin completing the square.  Divide all terms by
-4 the coefficient of the squared term: 

Divide each side by '-4'.
-0.25 + -10x + x2 = 0

Move the constant term to the right:

Add '0.25' to each side of the equation.
-0.25 + -10x + 0.25 + x2 = 0 + 0.25

Reorder the terms:
-0.25 + 0.25 + -10x + x2 = 0 + 0.25

Combine like terms: -0.25 + 0.25 = 0.00
0.00 + -10x + x2 = 0 + 0.25
-10x + x2 = 0 + 0.25

Combine like terms: 0 + 0.25 = 0.25
-10x + x2 = 0.25

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 = 0.25 + 25

Reorder the terms:
25 + -10x + x2 = 0.25 + 25

Combine like terms: 0.25 + 25 = 25.25
25 + -10x + x2 = 25.25

Factor a perfect square on the left side:
(x + -5)(x + -5) = 25.25

Calculate the square root of the right side: 5.024937811

Break this problem into two subproblems by setting 
(x + -5) equal to 5.024937811 and -5.024937811.

Subproblem 1

x + -5 = 5.024937811 Simplifying x + -5 = 5.024937811 Reorder the terms: -5 + x = 5.024937811 Solving -5 + x = 5.024937811 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 = 5.024937811 + 5 Combine like terms: -5 + 5 = 0 0 + x = 5.024937811 + 5 x = 5.024937811 + 5 Combine like terms: 5.024937811 + 5 = 10.024937811 x = 10.024937811 Simplifying x = 10.024937811

Subproblem 2

x + -5 = -5.024937811 Simplifying x + -5 = -5.024937811 Reorder the terms: -5 + x = -5.024937811 Solving -5 + x = -5.024937811 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 = -5.024937811 + 5 Combine like terms: -5 + 5 = 0 0 + x = -5.024937811 + 5 x = -5.024937811 + 5 Combine like terms: -5.024937811 + 5 = -0.024937811 x = -0.024937811 Simplifying x = -0.024937811

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.024937811, -0.024937811}

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