3.5x^2-14x-40=0

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Solution for 3.5x^2-14x-40=0 equation:


Simplifying
3.5x2 + -14x + -40 = 0

Reorder the terms:
-40 + -14x + 3.5x2 = 0

Solving
-40 + -14x + 3.5x2 = 0

Solving for variable 'x'.

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

Divide each side by '3.5'.
-11.42857143 + -4x + x2 = 0

Move the constant term to the right:

Add '11.42857143' to each side of the equation.
-11.42857143 + -4x + 11.42857143 + x2 = 0 + 11.42857143

Reorder the terms:
-11.42857143 + 11.42857143 + -4x + x2 = 0 + 11.42857143

Combine like terms: -11.42857143 + 11.42857143 = 0.00000000
0.00000000 + -4x + x2 = 0 + 11.42857143
-4x + x2 = 0 + 11.42857143

Combine like terms: 0 + 11.42857143 = 11.42857143
-4x + x2 = 11.42857143

The x term is -4x.  Take half its coefficient (-2).
Square it (4) and add it to both sides.

Add '4' to each side of the equation.
-4x + 4 + x2 = 11.42857143 + 4

Reorder the terms:
4 + -4x + x2 = 11.42857143 + 4

Combine like terms: 11.42857143 + 4 = 15.42857143
4 + -4x + x2 = 15.42857143

Factor a perfect square on the left side:
(x + -2)(x + -2) = 15.42857143

Calculate the square root of the right side: 3.927922024

Break this problem into two subproblems by setting 
(x + -2) equal to 3.927922024 and -3.927922024.

Subproblem 1

x + -2 = 3.927922024 Simplifying x + -2 = 3.927922024 Reorder the terms: -2 + x = 3.927922024 Solving -2 + x = 3.927922024 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = 3.927922024 + 2 Combine like terms: -2 + 2 = 0 0 + x = 3.927922024 + 2 x = 3.927922024 + 2 Combine like terms: 3.927922024 + 2 = 5.927922024 x = 5.927922024 Simplifying x = 5.927922024

Subproblem 2

x + -2 = -3.927922024 Simplifying x + -2 = -3.927922024 Reorder the terms: -2 + x = -3.927922024 Solving -2 + x = -3.927922024 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2' to each side of the equation. -2 + 2 + x = -3.927922024 + 2 Combine like terms: -2 + 2 = 0 0 + x = -3.927922024 + 2 x = -3.927922024 + 2 Combine like terms: -3.927922024 + 2 = -1.927922024 x = -1.927922024 Simplifying x = -1.927922024

Solution

The solution to the problem is based on the solutions from the subproblems. x = {5.927922024, -1.927922024}

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