=2.52-(4.8x)-(.800x^2)

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Solution for =2.52-(4.8x)-(.800x^2) equation:


Simplifying
0 = 2.52 + -1(4.8x) + -1(0.800x2)

Remove parenthesis around (4.8x)
0 = 2.52 + -1 * 4.8x + -1(0.800x2)

Multiply -1 * 4.8
0 = 2.52 + -4.8x + -1(0.800x2)

Remove parenthesis around (0.800x2)
0 = 2.52 + -4.8x + -1 * 0.800x2

Multiply -1 * 0.800
0 = 2.52 + -4.8x + -0.8x2

Solving
0 = 2.52 + -4.8x + -0.8x2

Solving for variable 'x'.

Combine like terms: 0 + -2.52 = -2.52
-2.52 + 4.8x + 0.8x2 = 2.52 + -4.8x + -0.8x2 + -2.52 + 4.8x + 0.8x2

Reorder the terms:
-2.52 + 4.8x + 0.8x2 = 2.52 + -2.52 + -4.8x + 4.8x + -0.8x2 + 0.8x2

Combine like terms: 2.52 + -2.52 = 0.00
-2.52 + 4.8x + 0.8x2 = 0.00 + -4.8x + 4.8x + -0.8x2 + 0.8x2
-2.52 + 4.8x + 0.8x2 = -4.8x + 4.8x + -0.8x2 + 0.8x2

Combine like terms: -4.8x + 4.8x = 0.0
-2.52 + 4.8x + 0.8x2 = 0.0 + -0.8x2 + 0.8x2
-2.52 + 4.8x + 0.8x2 = -0.8x2 + 0.8x2

Combine like terms: -0.8x2 + 0.8x2 = 0.0
-2.52 + 4.8x + 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'.
-3.15 + 6x + x2 = 0

Move the constant term to the right:

Add '3.15' to each side of the equation.
-3.15 + 6x + 3.15 + x2 = 0 + 3.15

Reorder the terms:
-3.15 + 3.15 + 6x + x2 = 0 + 3.15

Combine like terms: -3.15 + 3.15 = 0.00
0.00 + 6x + x2 = 0 + 3.15
6x + x2 = 0 + 3.15

Combine like terms: 0 + 3.15 = 3.15
6x + x2 = 3.15

The x term is 6x.  Take half its coefficient (3).
Square it (9) and add it to both sides.

Add '9' to each side of the equation.
6x + 9 + x2 = 3.15 + 9

Reorder the terms:
9 + 6x + x2 = 3.15 + 9

Combine like terms: 3.15 + 9 = 12.15
9 + 6x + x2 = 12.15

Factor a perfect square on the left side:
(x + 3)(x + 3) = 12.15

Calculate the square root of the right side: 3.485685012

Break this problem into two subproblems by setting 
(x + 3) equal to 3.485685012 and -3.485685012.

Subproblem 1

x + 3 = 3.485685012 Simplifying x + 3 = 3.485685012 Reorder the terms: 3 + x = 3.485685012 Solving 3 + x = 3.485685012 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = 3.485685012 + -3 Combine like terms: 3 + -3 = 0 0 + x = 3.485685012 + -3 x = 3.485685012 + -3 Combine like terms: 3.485685012 + -3 = 0.485685012 x = 0.485685012 Simplifying x = 0.485685012

Subproblem 2

x + 3 = -3.485685012 Simplifying x + 3 = -3.485685012 Reorder the terms: 3 + x = -3.485685012 Solving 3 + x = -3.485685012 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3' to each side of the equation. 3 + -3 + x = -3.485685012 + -3 Combine like terms: 3 + -3 = 0 0 + x = -3.485685012 + -3 x = -3.485685012 + -3 Combine like terms: -3.485685012 + -3 = -6.485685012 x = -6.485685012 Simplifying x = -6.485685012

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.485685012, -6.485685012}

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