7.67x^2+2.78x-5.35=0

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Solution for 7.67x^2+2.78x-5.35=0 equation:


Simplifying
7.67x2 + 2.78x + -5.35 = 0

Reorder the terms:
-5.35 + 2.78x + 7.67x2 = 0

Solving
-5.35 + 2.78x + 7.67x2 = 0

Solving for variable 'x'.

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

Divide each side by '7.67'.
-0.6975228162 + 0.3624511082x + x2 = 0

Move the constant term to the right:

Add '0.6975228162' to each side of the equation.
-0.6975228162 + 0.3624511082x + 0.6975228162 + x2 = 0 + 0.6975228162

Reorder the terms:
-0.6975228162 + 0.6975228162 + 0.3624511082x + x2 = 0 + 0.6975228162

Combine like terms: -0.6975228162 + 0.6975228162 = 0.0000000000
0.0000000000 + 0.3624511082x + x2 = 0 + 0.6975228162
0.3624511082x + x2 = 0 + 0.6975228162

Combine like terms: 0 + 0.6975228162 = 0.6975228162
0.3624511082x + x2 = 0.6975228162

The x term is 0.3624511082x.  Take half its coefficient (0.1812255541).
Square it (0.03284270146) and add it to both sides.

Add '0.03284270146' to each side of the equation.
0.3624511082x + 0.03284270146 + x2 = 0.6975228162 + 0.03284270146

Reorder the terms:
0.03284270146 + 0.3624511082x + x2 = 0.6975228162 + 0.03284270146

Combine like terms: 0.6975228162 + 0.03284270146 = 0.73036551766
0.03284270146 + 0.3624511082x + x2 = 0.73036551766

Factor a perfect square on the left side:
(x + 0.1812255541)(x + 0.1812255541) = 0.73036551766

Calculate the square root of the right side: 0.854614251

Break this problem into two subproblems by setting 
(x + 0.1812255541) equal to 0.854614251 and -0.854614251.

Subproblem 1

x + 0.1812255541 = 0.854614251 Simplifying x + 0.1812255541 = 0.854614251 Reorder the terms: 0.1812255541 + x = 0.854614251 Solving 0.1812255541 + x = 0.854614251 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1812255541' to each side of the equation. 0.1812255541 + -0.1812255541 + x = 0.854614251 + -0.1812255541 Combine like terms: 0.1812255541 + -0.1812255541 = 0.0000000000 0.0000000000 + x = 0.854614251 + -0.1812255541 x = 0.854614251 + -0.1812255541 Combine like terms: 0.854614251 + -0.1812255541 = 0.6733886969 x = 0.6733886969 Simplifying x = 0.6733886969

Subproblem 2

x + 0.1812255541 = -0.854614251 Simplifying x + 0.1812255541 = -0.854614251 Reorder the terms: 0.1812255541 + x = -0.854614251 Solving 0.1812255541 + x = -0.854614251 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.1812255541' to each side of the equation. 0.1812255541 + -0.1812255541 + x = -0.854614251 + -0.1812255541 Combine like terms: 0.1812255541 + -0.1812255541 = 0.0000000000 0.0000000000 + x = -0.854614251 + -0.1812255541 x = -0.854614251 + -0.1812255541 Combine like terms: -0.854614251 + -0.1812255541 = -1.0358398051 x = -1.0358398051 Simplifying x = -1.0358398051

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.6733886969, -1.0358398051}

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