(2x+0.4)(4x-1.14)=0

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Solution for (2x+0.4)(4x-1.14)=0 equation:


Simplifying
(2x + 0.4)(4x + -1.14) = 0

Reorder the terms:
(0.4 + 2x)(4x + -1.14) = 0

Reorder the terms:
(0.4 + 2x)(-1.14 + 4x) = 0

Multiply (0.4 + 2x) * (-1.14 + 4x)
(0.4(-1.14 + 4x) + 2x * (-1.14 + 4x)) = 0
((-1.14 * 0.4 + 4x * 0.4) + 2x * (-1.14 + 4x)) = 0
((-0.456 + 1.6x) + 2x * (-1.14 + 4x)) = 0
(-0.456 + 1.6x + (-1.14 * 2x + 4x * 2x)) = 0
(-0.456 + 1.6x + (-2.28x + 8x2)) = 0

Combine like terms: 1.6x + -2.28x = -0.68x
(-0.456 + -0.68x + 8x2) = 0

Solving
-0.456 + -0.68x + 8x2 = 0

Solving for variable 'x'.

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

Divide each side by '8'.
-0.057 + -0.085x + x2 = 0

Move the constant term to the right:

Add '0.057' to each side of the equation.
-0.057 + -0.085x + 0.057 + x2 = 0 + 0.057

Reorder the terms:
-0.057 + 0.057 + -0.085x + x2 = 0 + 0.057

Combine like terms: -0.057 + 0.057 = 0.000
0.000 + -0.085x + x2 = 0 + 0.057
-0.085x + x2 = 0 + 0.057

Combine like terms: 0 + 0.057 = 0.057
-0.085x + x2 = 0.057

The x term is -0.085x.  Take half its coefficient (-0.0425).
Square it (0.00180625) and add it to both sides.

Add '0.00180625' to each side of the equation.
-0.085x + 0.00180625 + x2 = 0.057 + 0.00180625

Reorder the terms:
0.00180625 + -0.085x + x2 = 0.057 + 0.00180625

Combine like terms: 0.057 + 0.00180625 = 0.05880625
0.00180625 + -0.085x + x2 = 0.05880625

Factor a perfect square on the left side:
(x + -0.0425)(x + -0.0425) = 0.05880625

Calculate the square root of the right side: 0.2425

Break this problem into two subproblems by setting 
(x + -0.0425) equal to 0.2425 and -0.2425.

Subproblem 1

x + -0.0425 = 0.2425 Simplifying x + -0.0425 = 0.2425 Reorder the terms: -0.0425 + x = 0.2425 Solving -0.0425 + x = 0.2425 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.0425' to each side of the equation. -0.0425 + 0.0425 + x = 0.2425 + 0.0425 Combine like terms: -0.0425 + 0.0425 = 0.0000 0.0000 + x = 0.2425 + 0.0425 x = 0.2425 + 0.0425 Combine like terms: 0.2425 + 0.0425 = 0.285 x = 0.285 Simplifying x = 0.285

Subproblem 2

x + -0.0425 = -0.2425 Simplifying x + -0.0425 = -0.2425 Reorder the terms: -0.0425 + x = -0.2425 Solving -0.0425 + x = -0.2425 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.0425' to each side of the equation. -0.0425 + 0.0425 + x = -0.2425 + 0.0425 Combine like terms: -0.0425 + 0.0425 = 0.0000 0.0000 + x = -0.2425 + 0.0425 x = -0.2425 + 0.0425 Combine like terms: -0.2425 + 0.0425 = -0.2 x = -0.2 Simplifying x = -0.2

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.285, -0.2}

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