9x^2+16x-2=0

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Solution for 9x^2+16x-2=0 equation:


Simplifying
9x2 + 16x + -2 = 0

Reorder the terms:
-2 + 16x + 9x2 = 0

Solving
-2 + 16x + 9x2 = 0

Solving for variable 'x'.

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

Divide each side by '9'.
-0.2222222222 + 1.777777778x + x2 = 0

Move the constant term to the right:

Add '0.2222222222' to each side of the equation.
-0.2222222222 + 1.777777778x + 0.2222222222 + x2 = 0 + 0.2222222222

Reorder the terms:
-0.2222222222 + 0.2222222222 + 1.777777778x + x2 = 0 + 0.2222222222

Combine like terms: -0.2222222222 + 0.2222222222 = 0.0000000000
0.0000000000 + 1.777777778x + x2 = 0 + 0.2222222222
1.777777778x + x2 = 0 + 0.2222222222

Combine like terms: 0 + 0.2222222222 = 0.2222222222
1.777777778x + x2 = 0.2222222222

The x term is 1.777777778x.  Take half its coefficient (0.888888889).
Square it (0.7901234570) and add it to both sides.

Add '0.7901234570' to each side of the equation.
1.777777778x + 0.7901234570 + x2 = 0.2222222222 + 0.7901234570

Reorder the terms:
0.7901234570 + 1.777777778x + x2 = 0.2222222222 + 0.7901234570

Combine like terms: 0.2222222222 + 0.7901234570 = 1.0123456792
0.7901234570 + 1.777777778x + x2 = 1.0123456792

Factor a perfect square on the left side:
(x + 0.888888889)(x + 0.888888889) = 1.0123456792

Calculate the square root of the right side: 1.006153904

Break this problem into two subproblems by setting 
(x + 0.888888889) equal to 1.006153904 and -1.006153904.

Subproblem 1

x + 0.888888889 = 1.006153904 Simplifying x + 0.888888889 = 1.006153904 Reorder the terms: 0.888888889 + x = 1.006153904 Solving 0.888888889 + x = 1.006153904 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.888888889' to each side of the equation. 0.888888889 + -0.888888889 + x = 1.006153904 + -0.888888889 Combine like terms: 0.888888889 + -0.888888889 = 0.000000000 0.000000000 + x = 1.006153904 + -0.888888889 x = 1.006153904 + -0.888888889 Combine like terms: 1.006153904 + -0.888888889 = 0.117265015 x = 0.117265015 Simplifying x = 0.117265015

Subproblem 2

x + 0.888888889 = -1.006153904 Simplifying x + 0.888888889 = -1.006153904 Reorder the terms: 0.888888889 + x = -1.006153904 Solving 0.888888889 + x = -1.006153904 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.888888889' to each side of the equation. 0.888888889 + -0.888888889 + x = -1.006153904 + -0.888888889 Combine like terms: 0.888888889 + -0.888888889 = 0.000000000 0.000000000 + x = -1.006153904 + -0.888888889 x = -1.006153904 + -0.888888889 Combine like terms: -1.006153904 + -0.888888889 = -1.895042793 x = -1.895042793 Simplifying x = -1.895042793

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.117265015, -1.895042793}

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