-28.3=5.16x-4.9x^2

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Solution for -28.3=5.16x-4.9x^2 equation:


Simplifying
-28.3 = 5.16x + -4.9x2

Solving
-28.3 = 5.16x + -4.9x2

Solving for variable 'x'.

Reorder the terms:
-28.3 + -5.16x + 4.9x2 = 5.16x + -5.16x + -4.9x2 + 4.9x2

Combine like terms: 5.16x + -5.16x = 0.00
-28.3 + -5.16x + 4.9x2 = 0.00 + -4.9x2 + 4.9x2
-28.3 + -5.16x + 4.9x2 = -4.9x2 + 4.9x2

Combine like terms: -4.9x2 + 4.9x2 = 0.0
-28.3 + -5.16x + 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'.
-5.775510204 + -1.053061224x + x2 = 0

Move the constant term to the right:

Add '5.775510204' to each side of the equation.
-5.775510204 + -1.053061224x + 5.775510204 + x2 = 0 + 5.775510204

Reorder the terms:
-5.775510204 + 5.775510204 + -1.053061224x + x2 = 0 + 5.775510204

Combine like terms: -5.775510204 + 5.775510204 = 0.000000000
0.000000000 + -1.053061224x + x2 = 0 + 5.775510204
-1.053061224x + x2 = 0 + 5.775510204

Combine like terms: 0 + 5.775510204 = 5.775510204
-1.053061224x + x2 = 5.775510204

The x term is -1.053061224x.  Take half its coefficient (-0.526530612).
Square it (0.2772344854) and add it to both sides.

Add '0.2772344854' to each side of the equation.
-1.053061224x + 0.2772344854 + x2 = 5.775510204 + 0.2772344854

Reorder the terms:
0.2772344854 + -1.053061224x + x2 = 5.775510204 + 0.2772344854

Combine like terms: 5.775510204 + 0.2772344854 = 6.0527446894
0.2772344854 + -1.053061224x + x2 = 6.0527446894

Factor a perfect square on the left side:
(x + -0.526530612)(x + -0.526530612) = 6.0527446894

Calculate the square root of the right side: 2.460232649

Break this problem into two subproblems by setting 
(x + -0.526530612) equal to 2.460232649 and -2.460232649.

Subproblem 1

x + -0.526530612 = 2.460232649 Simplifying x + -0.526530612 = 2.460232649 Reorder the terms: -0.526530612 + x = 2.460232649 Solving -0.526530612 + x = 2.460232649 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.526530612' to each side of the equation. -0.526530612 + 0.526530612 + x = 2.460232649 + 0.526530612 Combine like terms: -0.526530612 + 0.526530612 = 0.000000000 0.000000000 + x = 2.460232649 + 0.526530612 x = 2.460232649 + 0.526530612 Combine like terms: 2.460232649 + 0.526530612 = 2.986763261 x = 2.986763261 Simplifying x = 2.986763261

Subproblem 2

x + -0.526530612 = -2.460232649 Simplifying x + -0.526530612 = -2.460232649 Reorder the terms: -0.526530612 + x = -2.460232649 Solving -0.526530612 + x = -2.460232649 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.526530612' to each side of the equation. -0.526530612 + 0.526530612 + x = -2.460232649 + 0.526530612 Combine like terms: -0.526530612 + 0.526530612 = 0.000000000 0.000000000 + x = -2.460232649 + 0.526530612 x = -2.460232649 + 0.526530612 Combine like terms: -2.460232649 + 0.526530612 = -1.933702037 x = -1.933702037 Simplifying x = -1.933702037

Solution

The solution to the problem is based on the solutions from the subproblems. x = {2.986763261, -1.933702037}

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