9x^2+39x-10=0

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Solution for 9x^2+39x-10=0 equation:


Simplifying
9x2 + 39x + -10 = 0

Reorder the terms:
-10 + 39x + 9x2 = 0

Solving
-10 + 39x + 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'.
-1.111111111 + 4.333333333x + x2 = 0

Move the constant term to the right:

Add '1.111111111' to each side of the equation.
-1.111111111 + 4.333333333x + 1.111111111 + x2 = 0 + 1.111111111

Reorder the terms:
-1.111111111 + 1.111111111 + 4.333333333x + x2 = 0 + 1.111111111

Combine like terms: -1.111111111 + 1.111111111 = 0.000000000
0.000000000 + 4.333333333x + x2 = 0 + 1.111111111
4.333333333x + x2 = 0 + 1.111111111

Combine like terms: 0 + 1.111111111 = 1.111111111
4.333333333x + x2 = 1.111111111

The x term is 4.333333333x.  Take half its coefficient (2.166666667).
Square it (4.694444446) and add it to both sides.

Add '4.694444446' to each side of the equation.
4.333333333x + 4.694444446 + x2 = 1.111111111 + 4.694444446

Reorder the terms:
4.694444446 + 4.333333333x + x2 = 1.111111111 + 4.694444446

Combine like terms: 1.111111111 + 4.694444446 = 5.805555557
4.694444446 + 4.333333333x + x2 = 5.805555557

Factor a perfect square on the left side:
(x + 2.166666667)(x + 2.166666667) = 5.805555557

Calculate the square root of the right side: 2.409472049

Break this problem into two subproblems by setting 
(x + 2.166666667) equal to 2.409472049 and -2.409472049.

Subproblem 1

x + 2.166666667 = 2.409472049 Simplifying x + 2.166666667 = 2.409472049 Reorder the terms: 2.166666667 + x = 2.409472049 Solving 2.166666667 + x = 2.409472049 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.166666667' to each side of the equation. 2.166666667 + -2.166666667 + x = 2.409472049 + -2.166666667 Combine like terms: 2.166666667 + -2.166666667 = 0.000000000 0.000000000 + x = 2.409472049 + -2.166666667 x = 2.409472049 + -2.166666667 Combine like terms: 2.409472049 + -2.166666667 = 0.242805382 x = 0.242805382 Simplifying x = 0.242805382

Subproblem 2

x + 2.166666667 = -2.409472049 Simplifying x + 2.166666667 = -2.409472049 Reorder the terms: 2.166666667 + x = -2.409472049 Solving 2.166666667 + x = -2.409472049 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.166666667' to each side of the equation. 2.166666667 + -2.166666667 + x = -2.409472049 + -2.166666667 Combine like terms: 2.166666667 + -2.166666667 = 0.000000000 0.000000000 + x = -2.409472049 + -2.166666667 x = -2.409472049 + -2.166666667 Combine like terms: -2.409472049 + -2.166666667 = -4.576138716 x = -4.576138716 Simplifying x = -4.576138716

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.242805382, -4.576138716}

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