(.30-x)(.40-x)=1.001248

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Solution for (.30-x)(.40-x)=1.001248 equation:


Simplifying
(0.30 + -1x)(0.40 + -1x) = 1.001248

Multiply (0.30 + -1x) * (0.40 + -1x)
(0.30(0.40 + -1x) + -1x * (0.40 + -1x)) = 1.001248
((0.40 * 0.30 + -1x * 0.30) + -1x * (0.40 + -1x)) = 1.001248
((0.12 + -0.3x) + -1x * (0.40 + -1x)) = 1.001248
(0.12 + -0.3x + (0.40 * -1x + -1x * -1x)) = 1.001248
(0.12 + -0.3x + (-0.4x + 1x2)) = 1.001248

Combine like terms: -0.3x + -0.4x = -0.7x
(0.12 + -0.7x + 1x2) = 1.001248

Solving
0.12 + -0.7x + 1x2 = 1.001248

Solving for variable 'x'.

Reorder the terms:
0.12 + -1.001248 + -0.7x + 1x2 = 1.001248 + -1.001248

Combine like terms: 0.12 + -1.001248 = -0.881248
-0.881248 + -0.7x + 1x2 = 1.001248 + -1.001248

Combine like terms: 1.001248 + -1.001248 = 0.000000
-0.881248 + -0.7x + 1x2 = 0.000000

Begin completing the square.

Move the constant term to the right:

Add '0.881248' to each side of the equation.
-0.881248 + -0.7x + 0.881248 + x2 = 0.000000 + 0.881248

Reorder the terms:
-0.881248 + 0.881248 + -0.7x + x2 = 0.000000 + 0.881248

Combine like terms: -0.881248 + 0.881248 = 0.000000
0.000000 + -0.7x + x2 = 0.000000 + 0.881248
-0.7x + x2 = 0.000000 + 0.881248

Combine like terms: 0.000000 + 0.881248 = 0.881248
-0.7x + x2 = 0.881248

The x term is -0.7x.  Take half its coefficient (-0.35).
Square it (0.1225) and add it to both sides.

Add '0.1225' to each side of the equation.
-0.7x + 0.1225 + x2 = 0.881248 + 0.1225

Reorder the terms:
0.1225 + -0.7x + x2 = 0.881248 + 0.1225

Combine like terms: 0.881248 + 0.1225 = 1.003748
0.1225 + -0.7x + x2 = 1.003748

Factor a perfect square on the left side:
(x + -0.35)(x + -0.35) = 1.003748

Calculate the square root of the right side: 1.001872247

Break this problem into two subproblems by setting 
(x + -0.35) equal to 1.001872247 and -1.001872247.

Subproblem 1

x + -0.35 = 1.001872247 Simplifying x + -0.35 = 1.001872247 Reorder the terms: -0.35 + x = 1.001872247 Solving -0.35 + x = 1.001872247 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.35' to each side of the equation. -0.35 + 0.35 + x = 1.001872247 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + x = 1.001872247 + 0.35 x = 1.001872247 + 0.35 Combine like terms: 1.001872247 + 0.35 = 1.351872247 x = 1.351872247 Simplifying x = 1.351872247

Subproblem 2

x + -0.35 = -1.001872247 Simplifying x + -0.35 = -1.001872247 Reorder the terms: -0.35 + x = -1.001872247 Solving -0.35 + x = -1.001872247 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.35' to each side of the equation. -0.35 + 0.35 + x = -1.001872247 + 0.35 Combine like terms: -0.35 + 0.35 = 0.00 0.00 + x = -1.001872247 + 0.35 x = -1.001872247 + 0.35 Combine like terms: -1.001872247 + 0.35 = -0.651872247 x = -0.651872247 Simplifying x = -0.651872247

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.351872247, -0.651872247}

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