7x^2-11x-10=0

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Solution for 7x^2-11x-10=0 equation:


Simplifying
7x2 + -11x + -10 = 0

Reorder the terms:
-10 + -11x + 7x2 = 0

Solving
-10 + -11x + 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 + -1.571428571x + x2 = 0

Move the constant term to the right:

Add '1.428571429' to each side of the equation.
-1.428571429 + -1.571428571x + 1.428571429 + x2 = 0 + 1.428571429

Reorder the terms:
-1.428571429 + 1.428571429 + -1.571428571x + x2 = 0 + 1.428571429

Combine like terms: -1.428571429 + 1.428571429 = 0.000000000
0.000000000 + -1.571428571x + x2 = 0 + 1.428571429
-1.571428571x + x2 = 0 + 1.428571429

Combine like terms: 0 + 1.428571429 = 1.428571429
-1.571428571x + x2 = 1.428571429

The x term is -1.571428571x.  Take half its coefficient (-0.7857142855).
Square it (0.6173469384) and add it to both sides.

Add '0.6173469384' to each side of the equation.
-1.571428571x + 0.6173469384 + x2 = 1.428571429 + 0.6173469384

Reorder the terms:
0.6173469384 + -1.571428571x + x2 = 1.428571429 + 0.6173469384

Combine like terms: 1.428571429 + 0.6173469384 = 2.0459183674
0.6173469384 + -1.571428571x + x2 = 2.0459183674

Factor a perfect square on the left side:
(x + -0.7857142855)(x + -0.7857142855) = 2.0459183674

Calculate the square root of the right side: 1.430356028

Break this problem into two subproblems by setting 
(x + -0.7857142855) equal to 1.430356028 and -1.430356028.

Subproblem 1

x + -0.7857142855 = 1.430356028 Simplifying x + -0.7857142855 = 1.430356028 Reorder the terms: -0.7857142855 + x = 1.430356028 Solving -0.7857142855 + x = 1.430356028 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7857142855' to each side of the equation. -0.7857142855 + 0.7857142855 + x = 1.430356028 + 0.7857142855 Combine like terms: -0.7857142855 + 0.7857142855 = 0.0000000000 0.0000000000 + x = 1.430356028 + 0.7857142855 x = 1.430356028 + 0.7857142855 Combine like terms: 1.430356028 + 0.7857142855 = 2.2160703135 x = 2.2160703135 Simplifying x = 2.2160703135

Subproblem 2

x + -0.7857142855 = -1.430356028 Simplifying x + -0.7857142855 = -1.430356028 Reorder the terms: -0.7857142855 + x = -1.430356028 Solving -0.7857142855 + x = -1.430356028 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.7857142855' to each side of the equation. -0.7857142855 + 0.7857142855 + x = -1.430356028 + 0.7857142855 Combine like terms: -0.7857142855 + 0.7857142855 = 0.0000000000 0.0000000000 + x = -1.430356028 + 0.7857142855 x = -1.430356028 + 0.7857142855 Combine like terms: -1.430356028 + 0.7857142855 = -0.6446417425 x = -0.6446417425 Simplifying x = -0.6446417425

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.2160703135, -0.6446417425}

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