5x^2+3x-9=36

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Solution for 5x^2+3x-9=36 equation:


Simplifying
5x2 + 3x + -9 = 36

Reorder the terms:
-9 + 3x + 5x2 = 36

Solving
-9 + 3x + 5x2 = 36

Solving for variable 'x'.

Reorder the terms:
-9 + -36 + 3x + 5x2 = 36 + -36

Combine like terms: -9 + -36 = -45
-45 + 3x + 5x2 = 36 + -36

Combine like terms: 36 + -36 = 0
-45 + 3x + 5x2 = 0

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

Divide each side by '5'.
-9 + 0.6x + x2 = 0

Move the constant term to the right:

Add '9' to each side of the equation.
-9 + 0.6x + 9 + x2 = 0 + 9

Reorder the terms:
-9 + 9 + 0.6x + x2 = 0 + 9

Combine like terms: -9 + 9 = 0
0 + 0.6x + x2 = 0 + 9
0.6x + x2 = 0 + 9

Combine like terms: 0 + 9 = 9
0.6x + x2 = 9

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 = 9 + 0.09

Reorder the terms:
0.09 + 0.6x + x2 = 9 + 0.09

Combine like terms: 9 + 0.09 = 9.09
0.09 + 0.6x + x2 = 9.09

Factor a perfect square on the left side:
(x + 0.3)(x + 0.3) = 9.09

Calculate the square root of the right side: 3.014962686

Break this problem into two subproblems by setting 
(x + 0.3) equal to 3.014962686 and -3.014962686.

Subproblem 1

x + 0.3 = 3.014962686 Simplifying x + 0.3 = 3.014962686 Reorder the terms: 0.3 + x = 3.014962686 Solving 0.3 + x = 3.014962686 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 = 3.014962686 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = 3.014962686 + -0.3 x = 3.014962686 + -0.3 Combine like terms: 3.014962686 + -0.3 = 2.714962686 x = 2.714962686 Simplifying x = 2.714962686

Subproblem 2

x + 0.3 = -3.014962686 Simplifying x + 0.3 = -3.014962686 Reorder the terms: 0.3 + x = -3.014962686 Solving 0.3 + x = -3.014962686 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 = -3.014962686 + -0.3 Combine like terms: 0.3 + -0.3 = 0.0 0.0 + x = -3.014962686 + -0.3 x = -3.014962686 + -0.3 Combine like terms: -3.014962686 + -0.3 = -3.314962686 x = -3.314962686 Simplifying x = -3.314962686

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.714962686, -3.314962686}

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