3.2x^2+64x+120=0

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Solution for 3.2x^2+64x+120=0 equation:


Simplifying
3.2x2 + 64x + 120 = 0

Reorder the terms:
120 + 64x + 3.2x2 = 0

Solving
120 + 64x + 3.2x2 = 0

Solving for variable 'x'.

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

Divide each side by '3.2'.
37.5 + 20x + x2 = 0

Move the constant term to the right:

Add '-37.5' to each side of the equation.
37.5 + 20x + -37.5 + x2 = 0 + -37.5

Reorder the terms:
37.5 + -37.5 + 20x + x2 = 0 + -37.5

Combine like terms: 37.5 + -37.5 = 0.0
0.0 + 20x + x2 = 0 + -37.5
20x + x2 = 0 + -37.5

Combine like terms: 0 + -37.5 = -37.5
20x + x2 = -37.5

The x term is 20x.  Take half its coefficient (10).
Square it (100) and add it to both sides.

Add '100' to each side of the equation.
20x + 100 + x2 = -37.5 + 100

Reorder the terms:
100 + 20x + x2 = -37.5 + 100

Combine like terms: -37.5 + 100 = 62.5
100 + 20x + x2 = 62.5

Factor a perfect square on the left side:
(x + 10)(x + 10) = 62.5

Calculate the square root of the right side: 7.90569415

Break this problem into two subproblems by setting 
(x + 10) equal to 7.90569415 and -7.90569415.

Subproblem 1

x + 10 = 7.90569415 Simplifying x + 10 = 7.90569415 Reorder the terms: 10 + x = 7.90569415 Solving 10 + x = 7.90569415 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = 7.90569415 + -10 Combine like terms: 10 + -10 = 0 0 + x = 7.90569415 + -10 x = 7.90569415 + -10 Combine like terms: 7.90569415 + -10 = -2.09430585 x = -2.09430585 Simplifying x = -2.09430585

Subproblem 2

x + 10 = -7.90569415 Simplifying x + 10 = -7.90569415 Reorder the terms: 10 + x = -7.90569415 Solving 10 + x = -7.90569415 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + x = -7.90569415 + -10 Combine like terms: 10 + -10 = 0 0 + x = -7.90569415 + -10 x = -7.90569415 + -10 Combine like terms: -7.90569415 + -10 = -17.90569415 x = -17.90569415 Simplifying x = -17.90569415

Solution

The solution to the problem is based on the solutions from the subproblems. x = {-2.09430585, -17.90569415}

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