9x^2+15x=52

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Solution for 9x^2+15x=52 equation:


Simplifying
9x2 + 15x = 52

Reorder the terms:
15x + 9x2 = 52

Solving
15x + 9x2 = 52

Solving for variable 'x'.

Reorder the terms:
-52 + 15x + 9x2 = 52 + -52

Combine like terms: 52 + -52 = 0
-52 + 15x + 9x2 = 0

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

Divide each side by '9'.
-5.777777778 + 1.666666667x + x2 = 0

Move the constant term to the right:

Add '5.777777778' to each side of the equation.
-5.777777778 + 1.666666667x + 5.777777778 + x2 = 0 + 5.777777778

Reorder the terms:
-5.777777778 + 5.777777778 + 1.666666667x + x2 = 0 + 5.777777778

Combine like terms: -5.777777778 + 5.777777778 = 0.000000000
0.000000000 + 1.666666667x + x2 = 0 + 5.777777778
1.666666667x + x2 = 0 + 5.777777778

Combine like terms: 0 + 5.777777778 = 5.777777778
1.666666667x + x2 = 5.777777778

The x term is 1.666666667x.  Take half its coefficient (0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
1.666666667x + 0.6944444447 + x2 = 5.777777778 + 0.6944444447

Reorder the terms:
0.6944444447 + 1.666666667x + x2 = 5.777777778 + 0.6944444447

Combine like terms: 5.777777778 + 0.6944444447 = 6.4722222227
0.6944444447 + 1.666666667x + x2 = 6.4722222227

Factor a perfect square on the left side:
(x + 0.8333333335)(x + 0.8333333335) = 6.4722222227

Calculate the square root of the right side: 2.544056254

Break this problem into two subproblems by setting 
(x + 0.8333333335) equal to 2.544056254 and -2.544056254.

Subproblem 1

x + 0.8333333335 = 2.544056254 Simplifying x + 0.8333333335 = 2.544056254 Reorder the terms: 0.8333333335 + x = 2.544056254 Solving 0.8333333335 + x = 2.544056254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x = 2.544056254 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = 2.544056254 + -0.8333333335 x = 2.544056254 + -0.8333333335 Combine like terms: 2.544056254 + -0.8333333335 = 1.7107229205 x = 1.7107229205 Simplifying x = 1.7107229205

Subproblem 2

x + 0.8333333335 = -2.544056254 Simplifying x + 0.8333333335 = -2.544056254 Reorder the terms: 0.8333333335 + x = -2.544056254 Solving 0.8333333335 + x = -2.544056254 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.8333333335' to each side of the equation. 0.8333333335 + -0.8333333335 + x = -2.544056254 + -0.8333333335 Combine like terms: 0.8333333335 + -0.8333333335 = 0.0000000000 0.0000000000 + x = -2.544056254 + -0.8333333335 x = -2.544056254 + -0.8333333335 Combine like terms: -2.544056254 + -0.8333333335 = -3.3773895875 x = -3.3773895875 Simplifying x = -3.3773895875

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.7107229205, -3.3773895875}

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