4x^2+x-85=180

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Solution for 4x^2+x-85=180 equation:


Simplifying
4x2 + x + -85 = 180

Reorder the terms:
-85 + x + 4x2 = 180

Solving
-85 + x + 4x2 = 180

Solving for variable 'x'.

Reorder the terms:
-85 + -180 + x + 4x2 = 180 + -180

Combine like terms: -85 + -180 = -265
-265 + x + 4x2 = 180 + -180

Combine like terms: 180 + -180 = 0
-265 + x + 4x2 = 0

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

Divide each side by '4'.
-66.25 + 0.25x + x2 = 0

Move the constant term to the right:

Add '66.25' to each side of the equation.
-66.25 + 0.25x + 66.25 + x2 = 0 + 66.25

Reorder the terms:
-66.25 + 66.25 + 0.25x + x2 = 0 + 66.25

Combine like terms: -66.25 + 66.25 = 0.00
0.00 + 0.25x + x2 = 0 + 66.25
0.25x + x2 = 0 + 66.25

Combine like terms: 0 + 66.25 = 66.25
0.25x + x2 = 66.25

The x term is x.  Take half its coefficient (0.5).
Square it (0.25) and add it to both sides.

Add '0.25' to each side of the equation.
0.25x + 0.25 + x2 = 66.25 + 0.25

Reorder the terms:
0.25 + 0.25x + x2 = 66.25 + 0.25

Combine like terms: 66.25 + 0.25 = 66.5
0.25 + 0.25x + x2 = 66.5

Factor a perfect square on the left side:
(x + 0.5)(x + 0.5) = 66.5

Calculate the square root of the right side: 8.154753215

Break this problem into two subproblems by setting 
(x + 0.5) equal to 8.154753215 and -8.154753215.

Subproblem 1

x + 0.5 = 8.154753215 Simplifying x + 0.5 = 8.154753215 Reorder the terms: 0.5 + x = 8.154753215 Solving 0.5 + x = 8.154753215 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = 8.154753215 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = 8.154753215 + -0.5 x = 8.154753215 + -0.5 Combine like terms: 8.154753215 + -0.5 = 7.654753215 x = 7.654753215 Simplifying x = 7.654753215

Subproblem 2

x + 0.5 = -8.154753215 Simplifying x + 0.5 = -8.154753215 Reorder the terms: 0.5 + x = -8.154753215 Solving 0.5 + x = -8.154753215 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-0.5' to each side of the equation. 0.5 + -0.5 + x = -8.154753215 + -0.5 Combine like terms: 0.5 + -0.5 = 0.0 0.0 + x = -8.154753215 + -0.5 x = -8.154753215 + -0.5 Combine like terms: -8.154753215 + -0.5 = -8.654753215 x = -8.654753215 Simplifying x = -8.654753215

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.654753215, -8.654753215}

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