7x^2-25x-10=0

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Solution for 7x^2-25x-10=0 equation:


Simplifying
7x2 + -25x + -10 = 0

Reorder the terms:
-10 + -25x + 7x2 = 0

Solving
-10 + -25x + 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'.
-1.428571429 + -3.571428571x + x2 = 0

Move the constant term to the right:

Add '1.428571429' to each side of the equation.
-1.428571429 + -3.571428571x + 1.428571429 + x2 = 0 + 1.428571429

Reorder the terms:
-1.428571429 + 1.428571429 + -3.571428571x + x2 = 0 + 1.428571429

Combine like terms: -1.428571429 + 1.428571429 = 0.000000000
0.000000000 + -3.571428571x + x2 = 0 + 1.428571429
-3.571428571x + x2 = 0 + 1.428571429

Combine like terms: 0 + 1.428571429 = 1.428571429
-3.571428571x + x2 = 1.428571429

The x term is -3.571428571x.  Take half its coefficient (-1.785714286).
Square it (3.188775511) and add it to both sides.

Add '3.188775511' to each side of the equation.
-3.571428571x + 3.188775511 + x2 = 1.428571429 + 3.188775511

Reorder the terms:
3.188775511 + -3.571428571x + x2 = 1.428571429 + 3.188775511

Combine like terms: 1.428571429 + 3.188775511 = 4.61734694
3.188775511 + -3.571428571x + x2 = 4.61734694

Factor a perfect square on the left side:
(x + -1.785714286)(x + -1.785714286) = 4.61734694

Calculate the square root of the right side: 2.14880128

Break this problem into two subproblems by setting 
(x + -1.785714286) equal to 2.14880128 and -2.14880128.

Subproblem 1

x + -1.785714286 = 2.14880128 Simplifying x + -1.785714286 = 2.14880128 Reorder the terms: -1.785714286 + x = 2.14880128 Solving -1.785714286 + x = 2.14880128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.785714286' to each side of the equation. -1.785714286 + 1.785714286 + x = 2.14880128 + 1.785714286 Combine like terms: -1.785714286 + 1.785714286 = 0.000000000 0.000000000 + x = 2.14880128 + 1.785714286 x = 2.14880128 + 1.785714286 Combine like terms: 2.14880128 + 1.785714286 = 3.934515566 x = 3.934515566 Simplifying x = 3.934515566

Subproblem 2

x + -1.785714286 = -2.14880128 Simplifying x + -1.785714286 = -2.14880128 Reorder the terms: -1.785714286 + x = -2.14880128 Solving -1.785714286 + x = -2.14880128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.785714286' to each side of the equation. -1.785714286 + 1.785714286 + x = -2.14880128 + 1.785714286 Combine like terms: -1.785714286 + 1.785714286 = 0.000000000 0.000000000 + x = -2.14880128 + 1.785714286 x = -2.14880128 + 1.785714286 Combine like terms: -2.14880128 + 1.785714286 = -0.363086994 x = -0.363086994 Simplifying x = -0.363086994

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.934515566, -0.363086994}

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