7x^2-114x-25=0

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Solution for 7x^2-114x-25=0 equation:


Simplifying
7x2 + -114x + -25 = 0

Reorder the terms:
-25 + -114x + 7x2 = 0

Solving
-25 + -114x + 7x2 = 0

Solving for variable 'x'.

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

Divide each side by '7'.
-3.571428571 + -16.28571429x + x2 = 0

Move the constant term to the right:

Add '3.571428571' to each side of the equation.
-3.571428571 + -16.28571429x + 3.571428571 + x2 = 0 + 3.571428571

Reorder the terms:
-3.571428571 + 3.571428571 + -16.28571429x + x2 = 0 + 3.571428571

Combine like terms: -3.571428571 + 3.571428571 = 0.000000000
0.000000000 + -16.28571429x + x2 = 0 + 3.571428571
-16.28571429x + x2 = 0 + 3.571428571

Combine like terms: 0 + 3.571428571 = 3.571428571
-16.28571429x + x2 = 3.571428571

The x term is -16.28571429x.  Take half its coefficient (-8.142857145).
Square it (66.30612248) and add it to both sides.

Add '66.30612248' to each side of the equation.
-16.28571429x + 66.30612248 + x2 = 3.571428571 + 66.30612248

Reorder the terms:
66.30612248 + -16.28571429x + x2 = 3.571428571 + 66.30612248

Combine like terms: 3.571428571 + 66.30612248 = 69.877551051
66.30612248 + -16.28571429x + x2 = 69.877551051

Factor a perfect square on the left side:
(x + -8.142857145)(x + -8.142857145) = 69.877551051

Calculate the square root of the right side: 8.359279338

Break this problem into two subproblems by setting 
(x + -8.142857145) equal to 8.359279338 and -8.359279338.

Subproblem 1

x + -8.142857145 = 8.359279338 Simplifying x + -8.142857145 = 8.359279338 Reorder the terms: -8.142857145 + x = 8.359279338 Solving -8.142857145 + x = 8.359279338 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.142857145' to each side of the equation. -8.142857145 + 8.142857145 + x = 8.359279338 + 8.142857145 Combine like terms: -8.142857145 + 8.142857145 = 0.000000000 0.000000000 + x = 8.359279338 + 8.142857145 x = 8.359279338 + 8.142857145 Combine like terms: 8.359279338 + 8.142857145 = 16.502136483 x = 16.502136483 Simplifying x = 16.502136483

Subproblem 2

x + -8.142857145 = -8.359279338 Simplifying x + -8.142857145 = -8.359279338 Reorder the terms: -8.142857145 + x = -8.359279338 Solving -8.142857145 + x = -8.359279338 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8.142857145' to each side of the equation. -8.142857145 + 8.142857145 + x = -8.359279338 + 8.142857145 Combine like terms: -8.142857145 + 8.142857145 = 0.000000000 0.000000000 + x = -8.359279338 + 8.142857145 x = -8.359279338 + 8.142857145 Combine like terms: -8.359279338 + 8.142857145 = -0.216422193 x = -0.216422193 Simplifying x = -0.216422193

Solution

The solution to the problem is based on the solutions from the subproblems. x = {16.502136483, -0.216422193}

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