x=-2x^2+8x+10

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Solution for x=-2x^2+8x+10 equation:


Simplifying
x = -2x2 + 8x + 10

Reorder the terms:
x = 10 + 8x + -2x2

Solving
x = 10 + 8x + -2x2

Solving for variable 'x'.

Reorder the terms:
-10 + x + -8x + 2x2 = 10 + 8x + -2x2 + -10 + -8x + 2x2

Combine like terms: x + -8x = -7x
-10 + -7x + 2x2 = 10 + 8x + -2x2 + -10 + -8x + 2x2

Reorder the terms:
-10 + -7x + 2x2 = 10 + -10 + 8x + -8x + -2x2 + 2x2

Combine like terms: 10 + -10 = 0
-10 + -7x + 2x2 = 0 + 8x + -8x + -2x2 + 2x2
-10 + -7x + 2x2 = 8x + -8x + -2x2 + 2x2

Combine like terms: 8x + -8x = 0
-10 + -7x + 2x2 = 0 + -2x2 + 2x2
-10 + -7x + 2x2 = -2x2 + 2x2

Combine like terms: -2x2 + 2x2 = 0
-10 + -7x + 2x2 = 0

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

Divide each side by '2'.
-5 + -3.5x + x2 = 0

Move the constant term to the right:

Add '5' to each side of the equation.
-5 + -3.5x + 5 + x2 = 0 + 5

Reorder the terms:
-5 + 5 + -3.5x + x2 = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -3.5x + x2 = 0 + 5
-3.5x + x2 = 0 + 5

Combine like terms: 0 + 5 = 5
-3.5x + x2 = 5

The x term is -3.5x.  Take half its coefficient (-1.75).
Square it (3.0625) and add it to both sides.

Add '3.0625' to each side of the equation.
-3.5x + 3.0625 + x2 = 5 + 3.0625

Reorder the terms:
3.0625 + -3.5x + x2 = 5 + 3.0625

Combine like terms: 5 + 3.0625 = 8.0625
3.0625 + -3.5x + x2 = 8.0625

Factor a perfect square on the left side:
(x + -1.75)(x + -1.75) = 8.0625

Calculate the square root of the right side: 2.839454173

Break this problem into two subproblems by setting 
(x + -1.75) equal to 2.839454173 and -2.839454173.

Subproblem 1

x + -1.75 = 2.839454173 Simplifying x + -1.75 = 2.839454173 Reorder the terms: -1.75 + x = 2.839454173 Solving -1.75 + x = 2.839454173 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = 2.839454173 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = 2.839454173 + 1.75 x = 2.839454173 + 1.75 Combine like terms: 2.839454173 + 1.75 = 4.589454173 x = 4.589454173 Simplifying x = 4.589454173

Subproblem 2

x + -1.75 = -2.839454173 Simplifying x + -1.75 = -2.839454173 Reorder the terms: -1.75 + x = -2.839454173 Solving -1.75 + x = -2.839454173 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.75' to each side of the equation. -1.75 + 1.75 + x = -2.839454173 + 1.75 Combine like terms: -1.75 + 1.75 = 0.00 0.00 + x = -2.839454173 + 1.75 x = -2.839454173 + 1.75 Combine like terms: -2.839454173 + 1.75 = -1.089454173 x = -1.089454173 Simplifying x = -1.089454173

Solution

The solution to the problem is based on the solutions from the subproblems. x = {4.589454173, -1.089454173}

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