4x^2-x-3=315

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Solution for 4x^2-x-3=315 equation:


Simplifying
4x2 + -1x + -3 = 315

Reorder the terms:
-3 + -1x + 4x2 = 315

Solving
-3 + -1x + 4x2 = 315

Solving for variable 'x'.

Reorder the terms:
-3 + -315 + -1x + 4x2 = 315 + -315

Combine like terms: -3 + -315 = -318
-318 + -1x + 4x2 = 315 + -315

Combine like terms: 315 + -315 = 0
-318 + -1x + 4x2 = 0

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

Divide each side by '4'.
-79.5 + -0.25x + x2 = 0

Move the constant term to the right:

Add '79.5' to each side of the equation.
-79.5 + -0.25x + 79.5 + x2 = 0 + 79.5

Reorder the terms:
-79.5 + 79.5 + -0.25x + x2 = 0 + 79.5

Combine like terms: -79.5 + 79.5 = 0.0
0.0 + -0.25x + x2 = 0 + 79.5
-0.25x + x2 = 0 + 79.5

Combine like terms: 0 + 79.5 = 79.5
-0.25x + x2 = 79.5

The x term is -0.25x.  Take half its coefficient (-0.125).
Square it (0.015625) and add it to both sides.

Add '0.015625' to each side of the equation.
-0.25x + 0.015625 + x2 = 79.5 + 0.015625

Reorder the terms:
0.015625 + -0.25x + x2 = 79.5 + 0.015625

Combine like terms: 79.5 + 0.015625 = 79.515625
0.015625 + -0.25x + x2 = 79.515625

Factor a perfect square on the left side:
(x + -0.125)(x + -0.125) = 79.515625

Calculate the square root of the right side: 8.917153414

Break this problem into two subproblems by setting 
(x + -0.125) equal to 8.917153414 and -8.917153414.

Subproblem 1

x + -0.125 = 8.917153414 Simplifying x + -0.125 = 8.917153414 Reorder the terms: -0.125 + x = 8.917153414 Solving -0.125 + x = 8.917153414 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = 8.917153414 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = 8.917153414 + 0.125 x = 8.917153414 + 0.125 Combine like terms: 8.917153414 + 0.125 = 9.042153414 x = 9.042153414 Simplifying x = 9.042153414

Subproblem 2

x + -0.125 = -8.917153414 Simplifying x + -0.125 = -8.917153414 Reorder the terms: -0.125 + x = -8.917153414 Solving -0.125 + x = -8.917153414 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '0.125' to each side of the equation. -0.125 + 0.125 + x = -8.917153414 + 0.125 Combine like terms: -0.125 + 0.125 = 0.000 0.000 + x = -8.917153414 + 0.125 x = -8.917153414 + 0.125 Combine like terms: -8.917153414 + 0.125 = -8.792153414 x = -8.792153414 Simplifying x = -8.792153414

Solution

The solution to the problem is based on the solutions from the subproblems. x = {9.042153414, -8.792153414}

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