2.5x^2+12x=3480

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Solution for 2.5x^2+12x=3480 equation:


Simplifying
2.5x2 + 12x = 3480

Reorder the terms:
12x + 2.5x2 = 3480

Solving
12x + 2.5x2 = 3480

Solving for variable 'x'.

Reorder the terms:
-3480 + 12x + 2.5x2 = 3480 + -3480

Combine like terms: 3480 + -3480 = 0
-3480 + 12x + 2.5x2 = 0

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

Divide each side by '2.5'.
-1392 + 4.8x + x2 = 0

Move the constant term to the right:

Add '1392' to each side of the equation.
-1392 + 4.8x + 1392 + x2 = 0 + 1392

Reorder the terms:
-1392 + 1392 + 4.8x + x2 = 0 + 1392

Combine like terms: -1392 + 1392 = 0
0 + 4.8x + x2 = 0 + 1392
4.8x + x2 = 0 + 1392

Combine like terms: 0 + 1392 = 1392
4.8x + x2 = 1392

The x term is 4.8x.  Take half its coefficient (2.4).
Square it (5.76) and add it to both sides.

Add '5.76' to each side of the equation.
4.8x + 5.76 + x2 = 1392 + 5.76

Reorder the terms:
5.76 + 4.8x + x2 = 1392 + 5.76

Combine like terms: 1392 + 5.76 = 1397.76
5.76 + 4.8x + x2 = 1397.76

Factor a perfect square on the left side:
(x + 2.4)(x + 2.4) = 1397.76

Calculate the square root of the right side: 37.386628626

Break this problem into two subproblems by setting 
(x + 2.4) equal to 37.386628626 and -37.386628626.

Subproblem 1

x + 2.4 = 37.386628626 Simplifying x + 2.4 = 37.386628626 Reorder the terms: 2.4 + x = 37.386628626 Solving 2.4 + x = 37.386628626 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.4' to each side of the equation. 2.4 + -2.4 + x = 37.386628626 + -2.4 Combine like terms: 2.4 + -2.4 = 0.0 0.0 + x = 37.386628626 + -2.4 x = 37.386628626 + -2.4 Combine like terms: 37.386628626 + -2.4 = 34.986628626 x = 34.986628626 Simplifying x = 34.986628626

Subproblem 2

x + 2.4 = -37.386628626 Simplifying x + 2.4 = -37.386628626 Reorder the terms: 2.4 + x = -37.386628626 Solving 2.4 + x = -37.386628626 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2.4' to each side of the equation. 2.4 + -2.4 + x = -37.386628626 + -2.4 Combine like terms: 2.4 + -2.4 = 0.0 0.0 + x = -37.386628626 + -2.4 x = -37.386628626 + -2.4 Combine like terms: -37.386628626 + -2.4 = -39.786628626 x = -39.786628626 Simplifying x = -39.786628626

Solution

The solution to the problem is based on the solutions from the subproblems. x = {34.986628626, -39.786628626}

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