-9x^2+30x+35=0

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Solution for -9x^2+30x+35=0 equation:


Simplifying
-9x2 + 30x + 35 = 0

Reorder the terms:
35 + 30x + -9x2 = 0

Solving
35 + 30x + -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'.
-3.888888889 + -3.333333333x + x2 = 0

Move the constant term to the right:

Add '3.888888889' to each side of the equation.
-3.888888889 + -3.333333333x + 3.888888889 + x2 = 0 + 3.888888889

Reorder the terms:
-3.888888889 + 3.888888889 + -3.333333333x + x2 = 0 + 3.888888889

Combine like terms: -3.888888889 + 3.888888889 = 0.000000000
0.000000000 + -3.333333333x + x2 = 0 + 3.888888889
-3.333333333x + x2 = 0 + 3.888888889

Combine like terms: 0 + 3.888888889 = 3.888888889
-3.333333333x + x2 = 3.888888889

The x term is -3.333333333x.  Take half its coefficient (-1.666666667).
Square it (2.777777779) and add it to both sides.

Add '2.777777779' to each side of the equation.
-3.333333333x + 2.777777779 + x2 = 3.888888889 + 2.777777779

Reorder the terms:
2.777777779 + -3.333333333x + x2 = 3.888888889 + 2.777777779

Combine like terms: 3.888888889 + 2.777777779 = 6.666666668
2.777777779 + -3.333333333x + x2 = 6.666666668

Factor a perfect square on the left side:
(x + -1.666666667)(x + -1.666666667) = 6.666666668

Calculate the square root of the right side: 2.581988898

Break this problem into two subproblems by setting 
(x + -1.666666667) equal to 2.581988898 and -2.581988898.

Subproblem 1

x + -1.666666667 = 2.581988898 Simplifying x + -1.666666667 = 2.581988898 Reorder the terms: -1.666666667 + x = 2.581988898 Solving -1.666666667 + x = 2.581988898 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + x = 2.581988898 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + x = 2.581988898 + 1.666666667 x = 2.581988898 + 1.666666667 Combine like terms: 2.581988898 + 1.666666667 = 4.248655565 x = 4.248655565 Simplifying x = 4.248655565

Subproblem 2

x + -1.666666667 = -2.581988898 Simplifying x + -1.666666667 = -2.581988898 Reorder the terms: -1.666666667 + x = -2.581988898 Solving -1.666666667 + x = -2.581988898 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.666666667' to each side of the equation. -1.666666667 + 1.666666667 + x = -2.581988898 + 1.666666667 Combine like terms: -1.666666667 + 1.666666667 = 0.000000000 0.000000000 + x = -2.581988898 + 1.666666667 x = -2.581988898 + 1.666666667 Combine like terms: -2.581988898 + 1.666666667 = -0.915322231 x = -0.915322231 Simplifying x = -0.915322231

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.248655565, -0.915322231}

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