(6.2x-3.4)(.7x+1.3)=

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Solution for (6.2x-3.4)(.7x+1.3)= equation:


Simplifying
(6.2x + -3.4)(0.7x + 1.3) = 0

Reorder the terms:
(-3.4 + 6.2x)(0.7x + 1.3) = 0

Reorder the terms:
(-3.4 + 6.2x)(1.3 + 0.7x) = 0

Multiply (-3.4 + 6.2x) * (1.3 + 0.7x)
(-3.4(1.3 + 0.7x) + 6.2x * (1.3 + 0.7x)) = 0
((1.3 * -3.4 + 0.7x * -3.4) + 6.2x * (1.3 + 0.7x)) = 0
((-4.42 + -2.38x) + 6.2x * (1.3 + 0.7x)) = 0
(-4.42 + -2.38x + (1.3 * 6.2x + 0.7x * 6.2x)) = 0
(-4.42 + -2.38x + (8.06x + 4.34x2)) = 0

Combine like terms: -2.38x + 8.06x = 5.68x
(-4.42 + 5.68x + 4.34x2) = 0

Solving
-4.42 + 5.68x + 4.34x2 = 0

Solving for variable 'x'.

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

Divide each side by '4.34'.
-1.01843318 + 1.30875576x + x2 = 0

Move the constant term to the right:

Add '1.01843318' to each side of the equation.
-1.01843318 + 1.30875576x + 1.01843318 + x2 = 0 + 1.01843318

Reorder the terms:
-1.01843318 + 1.01843318 + 1.30875576x + x2 = 0 + 1.01843318

Combine like terms: -1.01843318 + 1.01843318 = 0.00000000
0.00000000 + 1.30875576x + x2 = 0 + 1.01843318
1.30875576x + x2 = 0 + 1.01843318

Combine like terms: 0 + 1.01843318 = 1.01843318
1.30875576x + x2 = 1.01843318

The x term is 1.30875576x.  Take half its coefficient (0.65437788).
Square it (0.4282104098) and add it to both sides.

Add '0.4282104098' to each side of the equation.
1.30875576x + 0.4282104098 + x2 = 1.01843318 + 0.4282104098

Reorder the terms:
0.4282104098 + 1.30875576x + x2 = 1.01843318 + 0.4282104098

Combine like terms: 1.01843318 + 0.4282104098 = 1.4466435898
0.4282104098 + 1.30875576x + x2 = 1.4466435898

Factor a perfect square on the left side:
(x + 0.65437788)(x + 0.65437788) = 1.4466435898

Calculate the square root of the right side: 1.202764977

Break this problem into two subproblems by setting 
(x + 0.65437788) equal to 1.202764977 and -1.202764977.

Subproblem 1

x + 0.65437788 = 1.202764977 Simplifying x + 0.65437788 = 1.202764977 Reorder the terms: 0.65437788 + x = 1.202764977 Solving 0.65437788 + x = 1.202764977 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.65437788' to each side of the equation. 0.65437788 + -0.65437788 + x = 1.202764977 + -0.65437788 Combine like terms: 0.65437788 + -0.65437788 = 0.00000000 0.00000000 + x = 1.202764977 + -0.65437788 x = 1.202764977 + -0.65437788 Combine like terms: 1.202764977 + -0.65437788 = 0.548387097 x = 0.548387097 Simplifying x = 0.548387097

Subproblem 2

x + 0.65437788 = -1.202764977 Simplifying x + 0.65437788 = -1.202764977 Reorder the terms: 0.65437788 + x = -1.202764977 Solving 0.65437788 + x = -1.202764977 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.65437788' to each side of the equation. 0.65437788 + -0.65437788 + x = -1.202764977 + -0.65437788 Combine like terms: 0.65437788 + -0.65437788 = 0.00000000 0.00000000 + x = -1.202764977 + -0.65437788 x = -1.202764977 + -0.65437788 Combine like terms: -1.202764977 + -0.65437788 = -1.857142857 x = -1.857142857 Simplifying x = -1.857142857

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.548387097, -1.857142857}

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