5x^2+12x-64=0

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Solution for 5x^2+12x-64=0 equation:


Simplifying
5x2 + 12x + -64 = 0

Reorder the terms:
-64 + 12x + 5x2 = 0

Solving
-64 + 12x + 5x2 = 0

Solving for variable 'x'.

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

Divide each side by '5'.
-12.8 + 2.4x + x2 = 0

Move the constant term to the right:

Add '12.8' to each side of the equation.
-12.8 + 2.4x + 12.8 + x2 = 0 + 12.8

Reorder the terms:
-12.8 + 12.8 + 2.4x + x2 = 0 + 12.8

Combine like terms: -12.8 + 12.8 = 0.0
0.0 + 2.4x + x2 = 0 + 12.8
2.4x + x2 = 0 + 12.8

Combine like terms: 0 + 12.8 = 12.8
2.4x + x2 = 12.8

The x term is 2.4x.  Take half its coefficient (1.2).
Square it (1.44) and add it to both sides.

Add '1.44' to each side of the equation.
2.4x + 1.44 + x2 = 12.8 + 1.44

Reorder the terms:
1.44 + 2.4x + x2 = 12.8 + 1.44

Combine like terms: 12.8 + 1.44 = 14.24
1.44 + 2.4x + x2 = 14.24

Factor a perfect square on the left side:
(x + 1.2)(x + 1.2) = 14.24

Calculate the square root of the right side: 3.773592453

Break this problem into two subproblems by setting 
(x + 1.2) equal to 3.773592453 and -3.773592453.

Subproblem 1

x + 1.2 = 3.773592453 Simplifying x + 1.2 = 3.773592453 Reorder the terms: 1.2 + x = 3.773592453 Solving 1.2 + x = 3.773592453 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = 3.773592453 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = 3.773592453 + -1.2 x = 3.773592453 + -1.2 Combine like terms: 3.773592453 + -1.2 = 2.573592453 x = 2.573592453 Simplifying x = 2.573592453

Subproblem 2

x + 1.2 = -3.773592453 Simplifying x + 1.2 = -3.773592453 Reorder the terms: 1.2 + x = -3.773592453 Solving 1.2 + x = -3.773592453 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1.2' to each side of the equation. 1.2 + -1.2 + x = -3.773592453 + -1.2 Combine like terms: 1.2 + -1.2 = 0.0 0.0 + x = -3.773592453 + -1.2 x = -3.773592453 + -1.2 Combine like terms: -3.773592453 + -1.2 = -4.973592453 x = -4.973592453 Simplifying x = -4.973592453

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.573592453, -4.973592453}

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