0=-16x^2+102x+205

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Solution for 0=-16x^2+102x+205 equation:


Simplifying
0 = -16x2 + 102x + 205

Reorder the terms:
0 = 205 + 102x + -16x2

Solving
0 = 205 + 102x + -16x2

Solving for variable 'x'.

Combine like terms: 0 + -205 = -205
-205 + -102x + 16x2 = 205 + 102x + -16x2 + -205 + -102x + 16x2

Reorder the terms:
-205 + -102x + 16x2 = 205 + -205 + 102x + -102x + -16x2 + 16x2

Combine like terms: 205 + -205 = 0
-205 + -102x + 16x2 = 0 + 102x + -102x + -16x2 + 16x2
-205 + -102x + 16x2 = 102x + -102x + -16x2 + 16x2

Combine like terms: 102x + -102x = 0
-205 + -102x + 16x2 = 0 + -16x2 + 16x2
-205 + -102x + 16x2 = -16x2 + 16x2

Combine like terms: -16x2 + 16x2 = 0
-205 + -102x + 16x2 = 0

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

Divide each side by '16'.
-12.8125 + -6.375x + x2 = 0

Move the constant term to the right:

Add '12.8125' to each side of the equation.
-12.8125 + -6.375x + 12.8125 + x2 = 0 + 12.8125

Reorder the terms:
-12.8125 + 12.8125 + -6.375x + x2 = 0 + 12.8125

Combine like terms: -12.8125 + 12.8125 = 0.0000
0.0000 + -6.375x + x2 = 0 + 12.8125
-6.375x + x2 = 0 + 12.8125

Combine like terms: 0 + 12.8125 = 12.8125
-6.375x + x2 = 12.8125

The x term is -6.375x.  Take half its coefficient (-3.1875).
Square it (10.16015625) and add it to both sides.

Add '10.16015625' to each side of the equation.
-6.375x + 10.16015625 + x2 = 12.8125 + 10.16015625

Reorder the terms:
10.16015625 + -6.375x + x2 = 12.8125 + 10.16015625

Combine like terms: 12.8125 + 10.16015625 = 22.97265625
10.16015625 + -6.375x + x2 = 22.97265625

Factor a perfect square on the left side:
(x + -3.1875)(x + -3.1875) = 22.97265625

Calculate the square root of the right side: 4.792979893

Break this problem into two subproblems by setting 
(x + -3.1875) equal to 4.792979893 and -4.792979893.

Subproblem 1

x + -3.1875 = 4.792979893 Simplifying x + -3.1875 = 4.792979893 Reorder the terms: -3.1875 + x = 4.792979893 Solving -3.1875 + x = 4.792979893 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.1875' to each side of the equation. -3.1875 + 3.1875 + x = 4.792979893 + 3.1875 Combine like terms: -3.1875 + 3.1875 = 0.0000 0.0000 + x = 4.792979893 + 3.1875 x = 4.792979893 + 3.1875 Combine like terms: 4.792979893 + 3.1875 = 7.980479893 x = 7.980479893 Simplifying x = 7.980479893

Subproblem 2

x + -3.1875 = -4.792979893 Simplifying x + -3.1875 = -4.792979893 Reorder the terms: -3.1875 + x = -4.792979893 Solving -3.1875 + x = -4.792979893 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3.1875' to each side of the equation. -3.1875 + 3.1875 + x = -4.792979893 + 3.1875 Combine like terms: -3.1875 + 3.1875 = 0.0000 0.0000 + x = -4.792979893 + 3.1875 x = -4.792979893 + 3.1875 Combine like terms: -4.792979893 + 3.1875 = -1.605479893 x = -1.605479893 Simplifying x = -1.605479893

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.980479893, -1.605479893}

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