5=10+4.9x-4.9(x^2)

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Solution for 5=10+4.9x-4.9(x^2) equation:


Simplifying
5 = 10 + 4.9x + -4.9(x2)

Solving
5 = 10 + 4.9x + -4.9x2

Solving for variable 'x'.

Combine like terms: 5 + -10 = -5
-5 + -4.9x + 4.9x2 = 10 + 4.9x + -4.9x2 + -10 + -4.9x + 4.9x2

Reorder the terms:
-5 + -4.9x + 4.9x2 = 10 + -10 + 4.9x + -4.9x + -4.9x2 + 4.9x2

Combine like terms: 10 + -10 = 0
-5 + -4.9x + 4.9x2 = 0 + 4.9x + -4.9x + -4.9x2 + 4.9x2
-5 + -4.9x + 4.9x2 = 4.9x + -4.9x + -4.9x2 + 4.9x2

Combine like terms: 4.9x + -4.9x = 0.0
-5 + -4.9x + 4.9x2 = 0.0 + -4.9x2 + 4.9x2
-5 + -4.9x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
-5 + -4.9x + 4.9x2 = 0.0

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

Divide each side by '4.9'.
-1.020408163 + -1x + x2 = 0

Move the constant term to the right:

Add '1.020408163' to each side of the equation.
-1.020408163 + -1x + 1.020408163 + x2 = 0 + 1.020408163

Reorder the terms:
-1.020408163 + 1.020408163 + -1x + x2 = 0 + 1.020408163

Combine like terms: -1.020408163 + 1.020408163 = 0.000000000
0.000000000 + -1x + x2 = 0 + 1.020408163
-1x + x2 = 0 + 1.020408163

Combine like terms: 0 + 1.020408163 = 1.020408163
-1x + x2 = 1.020408163

The x term is -1x.  Take half its coefficient (-0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
-1x + 0.25 + x2 = 1.020408163 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 1.020408163 + 0.25

Combine like terms: 1.020408163 + 0.25 = 1.270408163
0.25 + -1x + x2 = 1.270408163

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 1.270408163

Calculate the square root of the right side: 1.127123845

Break this problem into two subproblems by setting 
(x + -0.5) equal to 1.127123845 and -1.127123845.

Subproblem 1

x + -0.5 = 1.127123845 Simplifying x + -0.5 = 1.127123845 Reorder the terms: -0.5 + x = 1.127123845 Solving -0.5 + x = 1.127123845 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = 1.127123845 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 1.127123845 + 0.5 x = 1.127123845 + 0.5 Combine like terms: 1.127123845 + 0.5 = 1.627123845 x = 1.627123845 Simplifying x = 1.627123845

Subproblem 2

x + -0.5 = -1.127123845 Simplifying x + -0.5 = -1.127123845 Reorder the terms: -0.5 + x = -1.127123845 Solving -0.5 + x = -1.127123845 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.5' to each side of the equation. -0.5 + 0.5 + x = -1.127123845 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -1.127123845 + 0.5 x = -1.127123845 + 0.5 Combine like terms: -1.127123845 + 0.5 = -0.627123845 x = -0.627123845 Simplifying x = -0.627123845

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.627123845, -0.627123845}

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