8=10x^2-3x-4

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Solution for 8=10x^2-3x-4 equation:


Simplifying
8 = 10x2 + -3x + -4

Reorder the terms:
8 = -4 + -3x + 10x2

Solving
8 = -4 + -3x + 10x2

Solving for variable 'x'.

Combine like terms: 8 + 4 = 12
12 + 3x + -10x2 = -4 + -3x + 10x2 + 4 + 3x + -10x2

Reorder the terms:
12 + 3x + -10x2 = -4 + 4 + -3x + 3x + 10x2 + -10x2

Combine like terms: -4 + 4 = 0
12 + 3x + -10x2 = 0 + -3x + 3x + 10x2 + -10x2
12 + 3x + -10x2 = -3x + 3x + 10x2 + -10x2

Combine like terms: -3x + 3x = 0
12 + 3x + -10x2 = 0 + 10x2 + -10x2
12 + 3x + -10x2 = 10x2 + -10x2

Combine like terms: 10x2 + -10x2 = 0
12 + 3x + -10x2 = 0

Begin completing the square.  Divide all terms by
-10 the coefficient of the squared term: 

Divide each side by '-10'.
-1.2 + -0.3x + x2 = 0

Move the constant term to the right:

Add '1.2' to each side of the equation.
-1.2 + -0.3x + 1.2 + x2 = 0 + 1.2

Reorder the terms:
-1.2 + 1.2 + -0.3x + x2 = 0 + 1.2

Combine like terms: -1.2 + 1.2 = 0.0
0.0 + -0.3x + x2 = 0 + 1.2
-0.3x + x2 = 0 + 1.2

Combine like terms: 0 + 1.2 = 1.2
-0.3x + x2 = 1.2

The x term is -0.3x.  Take half its coefficient (-0.15).
Square it (0.0225) and add it to both sides.

Add '0.0225' to each side of the equation.
-0.3x + 0.0225 + x2 = 1.2 + 0.0225

Reorder the terms:
0.0225 + -0.3x + x2 = 1.2 + 0.0225

Combine like terms: 1.2 + 0.0225 = 1.2225
0.0225 + -0.3x + x2 = 1.2225

Factor a perfect square on the left side:
(x + -0.15)(x + -0.15) = 1.2225

Calculate the square root of the right side: 1.105667219

Break this problem into two subproblems by setting 
(x + -0.15) equal to 1.105667219 and -1.105667219.

Subproblem 1

x + -0.15 = 1.105667219 Simplifying x + -0.15 = 1.105667219 Reorder the terms: -0.15 + x = 1.105667219 Solving -0.15 + x = 1.105667219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + x = 1.105667219 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = 1.105667219 + 0.15 x = 1.105667219 + 0.15 Combine like terms: 1.105667219 + 0.15 = 1.255667219 x = 1.255667219 Simplifying x = 1.255667219

Subproblem 2

x + -0.15 = -1.105667219 Simplifying x + -0.15 = -1.105667219 Reorder the terms: -0.15 + x = -1.105667219 Solving -0.15 + x = -1.105667219 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.15' to each side of the equation. -0.15 + 0.15 + x = -1.105667219 + 0.15 Combine like terms: -0.15 + 0.15 = 0.00 0.00 + x = -1.105667219 + 0.15 x = -1.105667219 + 0.15 Combine like terms: -1.105667219 + 0.15 = -0.955667219 x = -0.955667219 Simplifying x = -0.955667219

Solution

The solution to the problem is based on the solutions from the subproblems. x = {1.255667219, -0.955667219}

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