15x^2+9x-700=0

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Solution for 15x^2+9x-700=0 equation:


Simplifying
15x2 + 9x + -700 = 0

Reorder the terms:
-700 + 9x + 15x2 = 0

Solving
-700 + 9x + 15x2 = 0

Solving for variable 'x'.

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

Divide each side by '15'.
-46.66666667 + 0.6x + x2 = 0

Move the constant term to the right:

Add '46.66666667' to each side of the equation.
-46.66666667 + 0.6x + 46.66666667 + x2 = 0 + 46.66666667

Reorder the terms:
-46.66666667 + 46.66666667 + 0.6x + x2 = 0 + 46.66666667

Combine like terms: -46.66666667 + 46.66666667 = 0.00000000
0.00000000 + 0.6x + x2 = 0 + 46.66666667
0.6x + x2 = 0 + 46.66666667

Combine like terms: 0 + 46.66666667 = 46.66666667
0.6x + x2 = 46.66666667

The x term is 0.6x.  Take half its coefficient (0.3).
Square it (0.09) and add it to both sides.

Add '0.09' to each side of the equation.
0.6x + 0.09 + x2 = 46.66666667 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 46.66666667 + 0.09

Combine like terms: 46.66666667 + 0.09 = 46.75666667
0.09 + 0.6x + x2 = 46.75666667

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 46.75666667

Calculate the square root of the right side: 6.837884663

Break this problem into two subproblems by setting 
(x + 0.3) equal to 6.837884663 and -6.837884663.

Subproblem 1

x + 0.3 = 6.837884663 Simplifying x + 0.3 = 6.837884663 Reorder the terms: 0.3 + x = 6.837884663 Solving 0.3 + x = 6.837884663 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = 6.837884663 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 6.837884663 + -0.3 x = 6.837884663 + -0.3 Combine like terms: 6.837884663 + -0.3 = 6.537884663 x = 6.537884663 Simplifying x = 6.537884663

Subproblem 2

x + 0.3 = -6.837884663 Simplifying x + 0.3 = -6.837884663 Reorder the terms: 0.3 + x = -6.837884663 Solving 0.3 + x = -6.837884663 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.3' to each side of the equation. 0.3 + -0.3 + x = -6.837884663 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -6.837884663 + -0.3 x = -6.837884663 + -0.3 Combine like terms: -6.837884663 + -0.3 = -7.137884663 x = -7.137884663 Simplifying x = -7.137884663

Solution

The solution to the problem is based on the solutions from the subproblems. x = {6.537884663, -7.137884663}

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