14x^2+35x-20=0

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Solution for 14x^2+35x-20=0 equation:


Simplifying
14x2 + 35x + -20 = 0

Reorder the terms:
-20 + 35x + 14x2 = 0

Solving
-20 + 35x + 14x2 = 0

Solving for variable 'x'.

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

Divide each side by '14'.
-1.428571429 + 2.5x + x2 = 0

Move the constant term to the right:

Add '1.428571429' to each side of the equation.
-1.428571429 + 2.5x + 1.428571429 + x2 = 0 + 1.428571429

Reorder the terms:
-1.428571429 + 1.428571429 + 2.5x + x2 = 0 + 1.428571429

Combine like terms: -1.428571429 + 1.428571429 = 0.000000000
0.000000000 + 2.5x + x2 = 0 + 1.428571429
2.5x + x2 = 0 + 1.428571429

Combine like terms: 0 + 1.428571429 = 1.428571429
2.5x + x2 = 1.428571429

The x term is 2.5x.  Take half its coefficient (1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
2.5x + 1.5625 + x2 = 1.428571429 + 1.5625

Reorder the terms:
1.5625 + 2.5x + x2 = 1.428571429 + 1.5625

Combine like terms: 1.428571429 + 1.5625 = 2.991071429
1.5625 + 2.5x + x2 = 2.991071429

Factor a perfect square on the left side:
(x + 1.25)(x + 1.25) = 2.991071429

Calculate the square root of the right side: 1.729471431

Break this problem into two subproblems by setting 
(x + 1.25) equal to 1.729471431 and -1.729471431.

Subproblem 1

x + 1.25 = 1.729471431 Simplifying x + 1.25 = 1.729471431 Reorder the terms: 1.25 + x = 1.729471431 Solving 1.25 + x = 1.729471431 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = 1.729471431 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = 1.729471431 + -1.25 x = 1.729471431 + -1.25 Combine like terms: 1.729471431 + -1.25 = 0.479471431 x = 0.479471431 Simplifying x = 0.479471431

Subproblem 2

x + 1.25 = -1.729471431 Simplifying x + 1.25 = -1.729471431 Reorder the terms: 1.25 + x = -1.729471431 Solving 1.25 + x = -1.729471431 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.25' to each side of the equation. 1.25 + -1.25 + x = -1.729471431 + -1.25 Combine like terms: 1.25 + -1.25 = 0.00 0.00 + x = -1.729471431 + -1.25 x = -1.729471431 + -1.25 Combine like terms: -1.729471431 + -1.25 = -2.979471431 x = -2.979471431 Simplifying x = -2.979471431

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.479471431, -2.979471431}

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