35x^2+40x-36=0

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Solution for 35x^2+40x-36=0 equation:


Simplifying
35x2 + 40x + -36 = 0

Reorder the terms:
-36 + 40x + 35x2 = 0

Solving
-36 + 40x + 35x2 = 0

Solving for variable 'x'.

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

Divide each side by '35'.
-1.028571429 + 1.142857143x + x2 = 0

Move the constant term to the right:

Add '1.028571429' to each side of the equation.
-1.028571429 + 1.142857143x + 1.028571429 + x2 = 0 + 1.028571429

Reorder the terms:
-1.028571429 + 1.028571429 + 1.142857143x + x2 = 0 + 1.028571429

Combine like terms: -1.028571429 + 1.028571429 = 0.000000000
0.000000000 + 1.142857143x + x2 = 0 + 1.028571429
1.142857143x + x2 = 0 + 1.028571429

Combine like terms: 0 + 1.028571429 = 1.028571429
1.142857143x + x2 = 1.028571429

The x term is 1.142857143x.  Take half its coefficient (0.5714285715).
Square it (0.3265306123) and add it to both sides.

Add '0.3265306123' to each side of the equation.
1.142857143x + 0.3265306123 + x2 = 1.028571429 + 0.3265306123

Reorder the terms:
0.3265306123 + 1.142857143x + x2 = 1.028571429 + 0.3265306123

Combine like terms: 1.028571429 + 0.3265306123 = 1.3551020413
0.3265306123 + 1.142857143x + x2 = 1.3551020413

Factor a perfect square on the left side:
(x + 0.5714285715)(x + 0.5714285715) = 1.3551020413

Calculate the square root of the right side: 1.164088502

Break this problem into two subproblems by setting 
(x + 0.5714285715) equal to 1.164088502 and -1.164088502.

Subproblem 1

x + 0.5714285715 = 1.164088502 Simplifying x + 0.5714285715 = 1.164088502 Reorder the terms: 0.5714285715 + x = 1.164088502 Solving 0.5714285715 + x = 1.164088502 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5714285715' to each side of the equation. 0.5714285715 + -0.5714285715 + x = 1.164088502 + -0.5714285715 Combine like terms: 0.5714285715 + -0.5714285715 = 0.0000000000 0.0000000000 + x = 1.164088502 + -0.5714285715 x = 1.164088502 + -0.5714285715 Combine like terms: 1.164088502 + -0.5714285715 = 0.5926599305 x = 0.5926599305 Simplifying x = 0.5926599305

Subproblem 2

x + 0.5714285715 = -1.164088502 Simplifying x + 0.5714285715 = -1.164088502 Reorder the terms: 0.5714285715 + x = -1.164088502 Solving 0.5714285715 + x = -1.164088502 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5714285715' to each side of the equation. 0.5714285715 + -0.5714285715 + x = -1.164088502 + -0.5714285715 Combine like terms: 0.5714285715 + -0.5714285715 = 0.0000000000 0.0000000000 + x = -1.164088502 + -0.5714285715 x = -1.164088502 + -0.5714285715 Combine like terms: -1.164088502 + -0.5714285715 = -1.7355170735 x = -1.7355170735 Simplifying x = -1.7355170735

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.5926599305, -1.7355170735}

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