4.9x(6-x)+36=2(x+9)-x^2

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Solution for 4.9x(6-x)+36=2(x+9)-x^2 equation:


Simplifying
4.9x(6 + -1x) + 36 = 2(x + 9) + -1x2
(6 * 4.9x + -1x * 4.9x) + 36 = 2(x + 9) + -1x2
(29.4x + -4.9x2) + 36 = 2(x + 9) + -1x2

Reorder the terms:
36 + 29.4x + -4.9x2 = 2(x + 9) + -1x2

Reorder the terms:
36 + 29.4x + -4.9x2 = 2(9 + x) + -1x2
36 + 29.4x + -4.9x2 = (9 * 2 + x * 2) + -1x2
36 + 29.4x + -4.9x2 = (18 + 2x) + -1x2

Solving
36 + 29.4x + -4.9x2 = 18 + 2x + -1x2

Solving for variable 'x'.

Reorder the terms:
36 + -18 + 29.4x + -2x + -4.9x2 + x2 = 18 + 2x + -1x2 + -18 + -2x + x2

Combine like terms: 36 + -18 = 18
18 + 29.4x + -2x + -4.9x2 + x2 = 18 + 2x + -1x2 + -18 + -2x + x2

Combine like terms: 29.4x + -2x = 27.4x
18 + 27.4x + -4.9x2 + x2 = 18 + 2x + -1x2 + -18 + -2x + x2

Combine like terms: -4.9x2 + x2 = -3.9x2
18 + 27.4x + -3.9x2 = 18 + 2x + -1x2 + -18 + -2x + x2

Reorder the terms:
18 + 27.4x + -3.9x2 = 18 + -18 + 2x + -2x + -1x2 + x2

Combine like terms: 18 + -18 = 0
18 + 27.4x + -3.9x2 = 0 + 2x + -2x + -1x2 + x2
18 + 27.4x + -3.9x2 = 2x + -2x + -1x2 + x2

Combine like terms: 2x + -2x = 0
18 + 27.4x + -3.9x2 = 0 + -1x2 + x2
18 + 27.4x + -3.9x2 = -1x2 + x2

Combine like terms: -1x2 + x2 = 0
18 + 27.4x + -3.9x2 = 0

Begin completing the square.  Divide all terms by
-3.9 the coefficient of the squared term: 

Divide each side by '-3.9'.
-4.615384615 + -7.025641026x + x2 = 0

Move the constant term to the right:

Add '4.615384615' to each side of the equation.
-4.615384615 + -7.025641026x + 4.615384615 + x2 = 0 + 4.615384615

Reorder the terms:
-4.615384615 + 4.615384615 + -7.025641026x + x2 = 0 + 4.615384615

Combine like terms: -4.615384615 + 4.615384615 = 0.000000000
0.000000000 + -7.025641026x + x2 = 0 + 4.615384615
-7.025641026x + x2 = 0 + 4.615384615

Combine like terms: 0 + 4.615384615 = 4.615384615
-7.025641026x + x2 = 4.615384615

The x term is -7.025641026x.  Take half its coefficient (-3.512820513).
Square it (12.33990796) and add it to both sides.

Add '12.33990796' to each side of the equation.
-7.025641026x + 12.33990796 + x2 = 4.615384615 + 12.33990796

Reorder the terms:
12.33990796 + -7.025641026x + x2 = 4.615384615 + 12.33990796

Combine like terms: 4.615384615 + 12.33990796 = 16.955292575
12.33990796 + -7.025641026x + x2 = 16.955292575

Factor a perfect square on the left side:
(x + -3.512820513)(x + -3.512820513) = 16.955292575

Calculate the square root of the right side: 4.117680485

Break this problem into two subproblems by setting 
(x + -3.512820513) equal to 4.117680485 and -4.117680485.

Subproblem 1

x + -3.512820513 = 4.117680485 Simplifying x + -3.512820513 = 4.117680485 Reorder the terms: -3.512820513 + x = 4.117680485 Solving -3.512820513 + x = 4.117680485 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.512820513' to each side of the equation. -3.512820513 + 3.512820513 + x = 4.117680485 + 3.512820513 Combine like terms: -3.512820513 + 3.512820513 = 0.000000000 0.000000000 + x = 4.117680485 + 3.512820513 x = 4.117680485 + 3.512820513 Combine like terms: 4.117680485 + 3.512820513 = 7.630500998 x = 7.630500998 Simplifying x = 7.630500998

Subproblem 2

x + -3.512820513 = -4.117680485 Simplifying x + -3.512820513 = -4.117680485 Reorder the terms: -3.512820513 + x = -4.117680485 Solving -3.512820513 + x = -4.117680485 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.512820513' to each side of the equation. -3.512820513 + 3.512820513 + x = -4.117680485 + 3.512820513 Combine like terms: -3.512820513 + 3.512820513 = 0.000000000 0.000000000 + x = -4.117680485 + 3.512820513 x = -4.117680485 + 3.512820513 Combine like terms: -4.117680485 + 3.512820513 = -0.604859972 x = -0.604859972 Simplifying x = -0.604859972

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.630500998, -0.604859972}

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