3=-16x^2+20x+6

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Solution for 3=-16x^2+20x+6 equation:


Simplifying
3 = -16x2 + 20x + 6

Reorder the terms:
3 = 6 + 20x + -16x2

Solving
3 = 6 + 20x + -16x2

Solving for variable 'x'.

Combine like terms: 3 + -6 = -3
-3 + -20x + 16x2 = 6 + 20x + -16x2 + -6 + -20x + 16x2

Reorder the terms:
-3 + -20x + 16x2 = 6 + -6 + 20x + -20x + -16x2 + 16x2

Combine like terms: 6 + -6 = 0
-3 + -20x + 16x2 = 0 + 20x + -20x + -16x2 + 16x2
-3 + -20x + 16x2 = 20x + -20x + -16x2 + 16x2

Combine like terms: 20x + -20x = 0
-3 + -20x + 16x2 = 0 + -16x2 + 16x2
-3 + -20x + 16x2 = -16x2 + 16x2

Combine like terms: -16x2 + 16x2 = 0
-3 + -20x + 16x2 = 0

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

Divide each side by '16'.
-0.1875 + -1.25x + x2 = 0

Move the constant term to the right:

Add '0.1875' to each side of the equation.
-0.1875 + -1.25x + 0.1875 + x2 = 0 + 0.1875

Reorder the terms:
-0.1875 + 0.1875 + -1.25x + x2 = 0 + 0.1875

Combine like terms: -0.1875 + 0.1875 = 0.0000
0.0000 + -1.25x + x2 = 0 + 0.1875
-1.25x + x2 = 0 + 0.1875

Combine like terms: 0 + 0.1875 = 0.1875
-1.25x + x2 = 0.1875

The x term is -1.25x.  Take half its coefficient (-0.625).
Square it (0.390625) and add it to both sides.

Add '0.390625' to each side of the equation.
-1.25x + 0.390625 + x2 = 0.1875 + 0.390625

Reorder the terms:
0.390625 + -1.25x + x2 = 0.1875 + 0.390625

Combine like terms: 0.1875 + 0.390625 = 0.578125
0.390625 + -1.25x + x2 = 0.578125

Factor a perfect square on the left side:
(x + -0.625)(x + -0.625) = 0.578125

Calculate the square root of the right side: 0.760345316

Break this problem into two subproblems by setting 
(x + -0.625) equal to 0.760345316 and -0.760345316.

Subproblem 1

x + -0.625 = 0.760345316 Simplifying x + -0.625 = 0.760345316 Reorder the terms: -0.625 + x = 0.760345316 Solving -0.625 + x = 0.760345316 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = 0.760345316 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = 0.760345316 + 0.625 x = 0.760345316 + 0.625 Combine like terms: 0.760345316 + 0.625 = 1.385345316 x = 1.385345316 Simplifying x = 1.385345316

Subproblem 2

x + -0.625 = -0.760345316 Simplifying x + -0.625 = -0.760345316 Reorder the terms: -0.625 + x = -0.760345316 Solving -0.625 + x = -0.760345316 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.625' to each side of the equation. -0.625 + 0.625 + x = -0.760345316 + 0.625 Combine like terms: -0.625 + 0.625 = 0.000 0.000 + x = -0.760345316 + 0.625 x = -0.760345316 + 0.625 Combine like terms: -0.760345316 + 0.625 = -0.135345316 x = -0.135345316 Simplifying x = -0.135345316

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.385345316, -0.135345316}

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