0=-.8x^2+14.4x+2

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Solution for 0=-.8x^2+14.4x+2 equation:


Simplifying
0 = -0.8x2 + 14.4x + 2

Reorder the terms:
0 = 2 + 14.4x + -0.8x2

Solving
0 = 2 + 14.4x + -0.8x2

Solving for variable 'x'.

Combine like terms: 0 + -2 = -2
-2 + -14.4x + 0.8x2 = 2 + 14.4x + -0.8x2 + -2 + -14.4x + 0.8x2

Reorder the terms:
-2 + -14.4x + 0.8x2 = 2 + -2 + 14.4x + -14.4x + -0.8x2 + 0.8x2

Combine like terms: 2 + -2 = 0
-2 + -14.4x + 0.8x2 = 0 + 14.4x + -14.4x + -0.8x2 + 0.8x2
-2 + -14.4x + 0.8x2 = 14.4x + -14.4x + -0.8x2 + 0.8x2

Combine like terms: 14.4x + -14.4x = 0.0
-2 + -14.4x + 0.8x2 = 0.0 + -0.8x2 + 0.8x2
-2 + -14.4x + 0.8x2 = -0.8x2 + 0.8x2

Combine like terms: -0.8x2 + 0.8x2 = 0.0
-2 + -14.4x + 0.8x2 = 0.0

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

Divide each side by '0.8'.
-2.5 + -18x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -18x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -18x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -18x + x2 = 0 + 2.5
-18x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-18x + x2 = 2.5

The x term is -18x.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x + 81 + x2 = 2.5 + 81

Reorder the terms:
81 + -18x + x2 = 2.5 + 81

Combine like terms: 2.5 + 81 = 83.5
81 + -18x + x2 = 83.5

Factor a perfect square on the left side:
(x + -9)(x + -9) = 83.5

Calculate the square root of the right side: 9.137833441

Break this problem into two subproblems by setting 
(x + -9) equal to 9.137833441 and -9.137833441.

Subproblem 1

x + -9 = 9.137833441 Simplifying x + -9 = 9.137833441 Reorder the terms: -9 + x = 9.137833441 Solving -9 + x = 9.137833441 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 9.137833441 + 9 Combine like terms: -9 + 9 = 0 0 + x = 9.137833441 + 9 x = 9.137833441 + 9 Combine like terms: 9.137833441 + 9 = 18.137833441 x = 18.137833441 Simplifying x = 18.137833441

Subproblem 2

x + -9 = -9.137833441 Simplifying x + -9 = -9.137833441 Reorder the terms: -9 + x = -9.137833441 Solving -9 + x = -9.137833441 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = -9.137833441 + 9 Combine like terms: -9 + 9 = 0 0 + x = -9.137833441 + 9 x = -9.137833441 + 9 Combine like terms: -9.137833441 + 9 = -0.137833441 x = -0.137833441 Simplifying x = -0.137833441

Solution

The solution to the problem is based on the solutions from the subproblems. x = {18.137833441, -0.137833441}

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