23x^2-5x-42=0

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Solution for 23x^2-5x-42=0 equation:


Simplifying
23x2 + -5x + -42 = 0

Reorder the terms:
-42 + -5x + 23x2 = 0

Solving
-42 + -5x + 23x2 = 0

Solving for variable 'x'.

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

Divide each side by '23'.
-1.826086957 + -0.2173913043x + x2 = 0

Move the constant term to the right:

Add '1.826086957' to each side of the equation.
-1.826086957 + -0.2173913043x + 1.826086957 + x2 = 0 + 1.826086957

Reorder the terms:
-1.826086957 + 1.826086957 + -0.2173913043x + x2 = 0 + 1.826086957

Combine like terms: -1.826086957 + 1.826086957 = 0.000000000
0.000000000 + -0.2173913043x + x2 = 0 + 1.826086957
-0.2173913043x + x2 = 0 + 1.826086957

Combine like terms: 0 + 1.826086957 = 1.826086957
-0.2173913043x + x2 = 1.826086957

The x term is -0.2173913043x.  Take half its coefficient (-0.1086956522).
Square it (0.01181474481) and add it to both sides.

Add '0.01181474481' to each side of the equation.
-0.2173913043x + 0.01181474481 + x2 = 1.826086957 + 0.01181474481

Reorder the terms:
0.01181474481 + -0.2173913043x + x2 = 1.826086957 + 0.01181474481

Combine like terms: 1.826086957 + 0.01181474481 = 1.83790170181
0.01181474481 + -0.2173913043x + x2 = 1.83790170181

Factor a perfect square on the left side:
(x + -0.1086956522)(x + -0.1086956522) = 1.83790170181

Calculate the square root of the right side: 1.355692333

Break this problem into two subproblems by setting 
(x + -0.1086956522) equal to 1.355692333 and -1.355692333.

Subproblem 1

x + -0.1086956522 = 1.355692333 Simplifying x + -0.1086956522 = 1.355692333 Reorder the terms: -0.1086956522 + x = 1.355692333 Solving -0.1086956522 + x = 1.355692333 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1086956522' to each side of the equation. -0.1086956522 + 0.1086956522 + x = 1.355692333 + 0.1086956522 Combine like terms: -0.1086956522 + 0.1086956522 = 0.0000000000 0.0000000000 + x = 1.355692333 + 0.1086956522 x = 1.355692333 + 0.1086956522 Combine like terms: 1.355692333 + 0.1086956522 = 1.4643879852 x = 1.4643879852 Simplifying x = 1.4643879852

Subproblem 2

x + -0.1086956522 = -1.355692333 Simplifying x + -0.1086956522 = -1.355692333 Reorder the terms: -0.1086956522 + x = -1.355692333 Solving -0.1086956522 + x = -1.355692333 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.1086956522' to each side of the equation. -0.1086956522 + 0.1086956522 + x = -1.355692333 + 0.1086956522 Combine like terms: -0.1086956522 + 0.1086956522 = 0.0000000000 0.0000000000 + x = -1.355692333 + 0.1086956522 x = -1.355692333 + 0.1086956522 Combine like terms: -1.355692333 + 0.1086956522 = -1.2469966808 x = -1.2469966808 Simplifying x = -1.2469966808

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.4643879852, -1.2469966808}

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