9x^2+26x+16=36

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Solution for 9x^2+26x+16=36 equation:


Simplifying
9x2 + 26x + 16 = 36

Reorder the terms:
16 + 26x + 9x2 = 36

Solving
16 + 26x + 9x2 = 36

Solving for variable 'x'.

Reorder the terms:
16 + -36 + 26x + 9x2 = 36 + -36

Combine like terms: 16 + -36 = -20
-20 + 26x + 9x2 = 36 + -36

Combine like terms: 36 + -36 = 0
-20 + 26x + 9x2 = 0

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

Divide each side by '9'.
-2.222222222 + 2.888888889x + x2 = 0

Move the constant term to the right:

Add '2.222222222' to each side of the equation.
-2.222222222 + 2.888888889x + 2.222222222 + x2 = 0 + 2.222222222

Reorder the terms:
-2.222222222 + 2.222222222 + 2.888888889x + x2 = 0 + 2.222222222

Combine like terms: -2.222222222 + 2.222222222 = 0.000000000
0.000000000 + 2.888888889x + x2 = 0 + 2.222222222
2.888888889x + x2 = 0 + 2.222222222

Combine like terms: 0 + 2.222222222 = 2.222222222
2.888888889x + x2 = 2.222222222

The x term is 2.888888889x.  Take half its coefficient (1.444444445).
Square it (2.086419755) and add it to both sides.

Add '2.086419755' to each side of the equation.
2.888888889x + 2.086419755 + x2 = 2.222222222 + 2.086419755

Reorder the terms:
2.086419755 + 2.888888889x + x2 = 2.222222222 + 2.086419755

Combine like terms: 2.222222222 + 2.086419755 = 4.308641977
2.086419755 + 2.888888889x + x2 = 4.308641977

Factor a perfect square on the left side:
(x + 1.444444445)(x + 1.444444445) = 4.308641977

Calculate the square root of the right side: 2.075726855

Break this problem into two subproblems by setting 
(x + 1.444444445) equal to 2.075726855 and -2.075726855.

Subproblem 1

x + 1.444444445 = 2.075726855 Simplifying x + 1.444444445 = 2.075726855 Reorder the terms: 1.444444445 + x = 2.075726855 Solving 1.444444445 + x = 2.075726855 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.444444445' to each side of the equation. 1.444444445 + -1.444444445 + x = 2.075726855 + -1.444444445 Combine like terms: 1.444444445 + -1.444444445 = 0.000000000 0.000000000 + x = 2.075726855 + -1.444444445 x = 2.075726855 + -1.444444445 Combine like terms: 2.075726855 + -1.444444445 = 0.63128241 x = 0.63128241 Simplifying x = 0.63128241

Subproblem 2

x + 1.444444445 = -2.075726855 Simplifying x + 1.444444445 = -2.075726855 Reorder the terms: 1.444444445 + x = -2.075726855 Solving 1.444444445 + x = -2.075726855 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.444444445' to each side of the equation. 1.444444445 + -1.444444445 + x = -2.075726855 + -1.444444445 Combine like terms: 1.444444445 + -1.444444445 = 0.000000000 0.000000000 + x = -2.075726855 + -1.444444445 x = -2.075726855 + -1.444444445 Combine like terms: -2.075726855 + -1.444444445 = -3.5201713 x = -3.5201713 Simplifying x = -3.5201713

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.63128241, -3.5201713}

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