84x^2-3x-2=0

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Solution for 84x^2-3x-2=0 equation:


Simplifying
84x2 + -3x + -2 = 0

Reorder the terms:
-2 + -3x + 84x2 = 0

Solving
-2 + -3x + 84x2 = 0

Solving for variable 'x'.

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

Divide each side by '84'.
-0.02380952381 + -0.03571428571x + x2 = 0

Move the constant term to the right:

Add '0.02380952381' to each side of the equation.
-0.02380952381 + -0.03571428571x + 0.02380952381 + x2 = 0 + 0.02380952381

Reorder the terms:
-0.02380952381 + 0.02380952381 + -0.03571428571x + x2 = 0 + 0.02380952381

Combine like terms: -0.02380952381 + 0.02380952381 = 0.00000000000
0.00000000000 + -0.03571428571x + x2 = 0 + 0.02380952381
-0.03571428571x + x2 = 0 + 0.02380952381

Combine like terms: 0 + 0.02380952381 = 0.02380952381
-0.03571428571x + x2 = 0.02380952381

The x term is -0.03571428571x.  Take half its coefficient (-0.01785714286).
Square it (0.0003188775511) and add it to both sides.

Add '0.0003188775511' to each side of the equation.
-0.03571428571x + 0.0003188775511 + x2 = 0.02380952381 + 0.0003188775511

Reorder the terms:
0.0003188775511 + -0.03571428571x + x2 = 0.02380952381 + 0.0003188775511

Combine like terms: 0.02380952381 + 0.0003188775511 = 0.0241284013611
0.0003188775511 + -0.03571428571x + x2 = 0.0241284013611

Factor a perfect square on the left side:
(x + -0.01785714286)(x + -0.01785714286) = 0.0241284013611

Calculate the square root of the right side: 0.155333195

Break this problem into two subproblems by setting 
(x + -0.01785714286) equal to 0.155333195 and -0.155333195.

Subproblem 1

x + -0.01785714286 = 0.155333195 Simplifying x + -0.01785714286 = 0.155333195 Reorder the terms: -0.01785714286 + x = 0.155333195 Solving -0.01785714286 + x = 0.155333195 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.01785714286' to each side of the equation. -0.01785714286 + 0.01785714286 + x = 0.155333195 + 0.01785714286 Combine like terms: -0.01785714286 + 0.01785714286 = 0.00000000000 0.00000000000 + x = 0.155333195 + 0.01785714286 x = 0.155333195 + 0.01785714286 Combine like terms: 0.155333195 + 0.01785714286 = 0.17319033786 x = 0.17319033786 Simplifying x = 0.17319033786

Subproblem 2

x + -0.01785714286 = -0.155333195 Simplifying x + -0.01785714286 = -0.155333195 Reorder the terms: -0.01785714286 + x = -0.155333195 Solving -0.01785714286 + x = -0.155333195 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.01785714286' to each side of the equation. -0.01785714286 + 0.01785714286 + x = -0.155333195 + 0.01785714286 Combine like terms: -0.01785714286 + 0.01785714286 = 0.00000000000 0.00000000000 + x = -0.155333195 + 0.01785714286 x = -0.155333195 + 0.01785714286 Combine like terms: -0.155333195 + 0.01785714286 = -0.13747605214 x = -0.13747605214 Simplifying x = -0.13747605214

Solution

The solution to the problem is based on the solutions from the subproblems. x = {0.17319033786, -0.13747605214}

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