1.4x^2-2x-10=0

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Solution for 1.4x^2-2x-10=0 equation:


Simplifying
1.4x2 + -2x + -10 = 0

Reorder the terms:
-10 + -2x + 1.4x2 = 0

Solving
-10 + -2x + 1.4x2 = 0

Solving for variable 'x'.

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

Divide each side by '1.4'.
-7.142857143 + -1.428571429x + x2 = 0

Move the constant term to the right:

Add '7.142857143' to each side of the equation.
-7.142857143 + -1.428571429x + 7.142857143 + x2 = 0 + 7.142857143

Reorder the terms:
-7.142857143 + 7.142857143 + -1.428571429x + x2 = 0 + 7.142857143

Combine like terms: -7.142857143 + 7.142857143 = 0.000000000
0.000000000 + -1.428571429x + x2 = 0 + 7.142857143
-1.428571429x + x2 = 0 + 7.142857143

Combine like terms: 0 + 7.142857143 = 7.142857143
-1.428571429x + x2 = 7.142857143

The x term is -1.428571429x.  Take half its coefficient (-0.7142857145).
Square it (0.5102040819) and add it to both sides.

Add '0.5102040819' to each side of the equation.
-1.428571429x + 0.5102040819 + x2 = 7.142857143 + 0.5102040819

Reorder the terms:
0.5102040819 + -1.428571429x + x2 = 7.142857143 + 0.5102040819

Combine like terms: 7.142857143 + 0.5102040819 = 7.6530612249
0.5102040819 + -1.428571429x + x2 = 7.6530612249

Factor a perfect square on the left side:
(x + -0.7142857145)(x + -0.7142857145) = 7.6530612249

Calculate the square root of the right side: 2.766416676

Break this problem into two subproblems by setting 
(x + -0.7142857145) equal to 2.766416676 and -2.766416676.

Subproblem 1

x + -0.7142857145 = 2.766416676 Simplifying x + -0.7142857145 = 2.766416676 Reorder the terms: -0.7142857145 + x = 2.766416676 Solving -0.7142857145 + x = 2.766416676 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7142857145' to each side of the equation. -0.7142857145 + 0.7142857145 + x = 2.766416676 + 0.7142857145 Combine like terms: -0.7142857145 + 0.7142857145 = 0.0000000000 0.0000000000 + x = 2.766416676 + 0.7142857145 x = 2.766416676 + 0.7142857145 Combine like terms: 2.766416676 + 0.7142857145 = 3.4807023905 x = 3.4807023905 Simplifying x = 3.4807023905

Subproblem 2

x + -0.7142857145 = -2.766416676 Simplifying x + -0.7142857145 = -2.766416676 Reorder the terms: -0.7142857145 + x = -2.766416676 Solving -0.7142857145 + x = -2.766416676 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7142857145' to each side of the equation. -0.7142857145 + 0.7142857145 + x = -2.766416676 + 0.7142857145 Combine like terms: -0.7142857145 + 0.7142857145 = 0.0000000000 0.0000000000 + x = -2.766416676 + 0.7142857145 x = -2.766416676 + 0.7142857145 Combine like terms: -2.766416676 + 0.7142857145 = -2.0521309615 x = -2.0521309615 Simplifying x = -2.0521309615

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.4807023905, -2.0521309615}

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