8x+4=5x^2-5x-10

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Solution for 8x+4=5x^2-5x-10 equation:


Simplifying
8x + 4 = 5x2 + -5x + -10

Reorder the terms:
4 + 8x = 5x2 + -5x + -10

Reorder the terms:
4 + 8x = -10 + -5x + 5x2

Solving
4 + 8x = -10 + -5x + 5x2

Solving for variable 'x'.

Reorder the terms:
4 + 10 + 8x + 5x + -5x2 = -10 + -5x + 5x2 + 10 + 5x + -5x2

Combine like terms: 4 + 10 = 14
14 + 8x + 5x + -5x2 = -10 + -5x + 5x2 + 10 + 5x + -5x2

Combine like terms: 8x + 5x = 13x
14 + 13x + -5x2 = -10 + -5x + 5x2 + 10 + 5x + -5x2

Reorder the terms:
14 + 13x + -5x2 = -10 + 10 + -5x + 5x + 5x2 + -5x2

Combine like terms: -10 + 10 = 0
14 + 13x + -5x2 = 0 + -5x + 5x + 5x2 + -5x2
14 + 13x + -5x2 = -5x + 5x + 5x2 + -5x2

Combine like terms: -5x + 5x = 0
14 + 13x + -5x2 = 0 + 5x2 + -5x2
14 + 13x + -5x2 = 5x2 + -5x2

Combine like terms: 5x2 + -5x2 = 0
14 + 13x + -5x2 = 0

Begin completing the square.  Divide all terms by
-5 the coefficient of the squared term: 

Divide each side by '-5'.
-2.8 + -2.6x + x2 = 0

Move the constant term to the right:

Add '2.8' to each side of the equation.
-2.8 + -2.6x + 2.8 + x2 = 0 + 2.8

Reorder the terms:
-2.8 + 2.8 + -2.6x + x2 = 0 + 2.8

Combine like terms: -2.8 + 2.8 = 0.0
0.0 + -2.6x + x2 = 0 + 2.8
-2.6x + x2 = 0 + 2.8

Combine like terms: 0 + 2.8 = 2.8
-2.6x + x2 = 2.8

The x term is -2.6x.  Take half its coefficient (-1.3).
Square it (1.69) and add it to both sides.

Add '1.69' to each side of the equation.
-2.6x + 1.69 + x2 = 2.8 + 1.69

Reorder the terms:
1.69 + -2.6x + x2 = 2.8 + 1.69

Combine like terms: 2.8 + 1.69 = 4.49
1.69 + -2.6x + x2 = 4.49

Factor a perfect square on the left side:
(x + -1.3)(x + -1.3) = 4.49

Calculate the square root of the right side: 2.11896201

Break this problem into two subproblems by setting 
(x + -1.3) equal to 2.11896201 and -2.11896201.

Subproblem 1

x + -1.3 = 2.11896201 Simplifying x + -1.3 = 2.11896201 Reorder the terms: -1.3 + x = 2.11896201 Solving -1.3 + x = 2.11896201 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.3' to each side of the equation. -1.3 + 1.3 + x = 2.11896201 + 1.3 Combine like terms: -1.3 + 1.3 = 0.0 0.0 + x = 2.11896201 + 1.3 x = 2.11896201 + 1.3 Combine like terms: 2.11896201 + 1.3 = 3.41896201 x = 3.41896201 Simplifying x = 3.41896201

Subproblem 2

x + -1.3 = -2.11896201 Simplifying x + -1.3 = -2.11896201 Reorder the terms: -1.3 + x = -2.11896201 Solving -1.3 + x = -2.11896201 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.3' to each side of the equation. -1.3 + 1.3 + x = -2.11896201 + 1.3 Combine like terms: -1.3 + 1.3 = 0.0 0.0 + x = -2.11896201 + 1.3 x = -2.11896201 + 1.3 Combine like terms: -2.11896201 + 1.3 = -0.81896201 x = -0.81896201 Simplifying x = -0.81896201

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.41896201, -0.81896201}

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