2.4x^2+9x=330

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Solution for 2.4x^2+9x=330 equation:


Simplifying
2.4x2 + 9x = 330

Reorder the terms:
9x + 2.4x2 = 330

Solving
9x + 2.4x2 = 330

Solving for variable 'x'.

Reorder the terms:
-330 + 9x + 2.4x2 = 330 + -330

Combine like terms: 330 + -330 = 0
-330 + 9x + 2.4x2 = 0

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

Divide each side by '2.4'.
-137.5 + 3.75x + x2 = 0

Move the constant term to the right:

Add '137.5' to each side of the equation.
-137.5 + 3.75x + 137.5 + x2 = 0 + 137.5

Reorder the terms:
-137.5 + 137.5 + 3.75x + x2 = 0 + 137.5

Combine like terms: -137.5 + 137.5 = 0.0
0.0 + 3.75x + x2 = 0 + 137.5
3.75x + x2 = 0 + 137.5

Combine like terms: 0 + 137.5 = 137.5
3.75x + x2 = 137.5

The x term is 3.75x.  Take half its coefficient (1.875).
Square it (3.515625) and add it to both sides.

Add '3.515625' to each side of the equation.
3.75x + 3.515625 + x2 = 137.5 + 3.515625

Reorder the terms:
3.515625 + 3.75x + x2 = 137.5 + 3.515625

Combine like terms: 137.5 + 3.515625 = 141.015625
3.515625 + 3.75x + x2 = 141.015625

Factor a perfect square on the left side:
(x + 1.875)(x + 1.875) = 141.015625

Calculate the square root of the right side: 11.875

Break this problem into two subproblems by setting 
(x + 1.875) equal to 11.875 and -11.875.

Subproblem 1

x + 1.875 = 11.875 Simplifying x + 1.875 = 11.875 Reorder the terms: 1.875 + x = 11.875 Solving 1.875 + x = 11.875 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.875' to each side of the equation. 1.875 + -1.875 + x = 11.875 + -1.875 Combine like terms: 1.875 + -1.875 = 0.000 0.000 + x = 11.875 + -1.875 x = 11.875 + -1.875 Combine like terms: 11.875 + -1.875 = 10 x = 10 Simplifying x = 10

Subproblem 2

x + 1.875 = -11.875 Simplifying x + 1.875 = -11.875 Reorder the terms: 1.875 + x = -11.875 Solving 1.875 + x = -11.875 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.875' to each side of the equation. 1.875 + -1.875 + x = -11.875 + -1.875 Combine like terms: 1.875 + -1.875 = 0.000 0.000 + x = -11.875 + -1.875 x = -11.875 + -1.875 Combine like terms: -11.875 + -1.875 = -13.75 x = -13.75 Simplifying x = -13.75

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10, -13.75}

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