4x^2+76x-805=0

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Solution for 4x^2+76x-805=0 equation:


Simplifying
4x2 + 76x + -805 = 0

Reorder the terms:
-805 + 76x + 4x2 = 0

Solving
-805 + 76x + 4x2 = 0

Solving for variable 'x'.

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

Divide each side by '4'.
-201.25 + 19x + x2 = 0

Move the constant term to the right:

Add '201.25' to each side of the equation.
-201.25 + 19x + 201.25 + x2 = 0 + 201.25

Reorder the terms:
-201.25 + 201.25 + 19x + x2 = 0 + 201.25

Combine like terms: -201.25 + 201.25 = 0.00
0.00 + 19x + x2 = 0 + 201.25
19x + x2 = 0 + 201.25

Combine like terms: 0 + 201.25 = 201.25
19x + x2 = 201.25

The x term is 19x.  Take half its coefficient (9.5).
Square it (90.25) and add it to both sides.

Add '90.25' to each side of the equation.
19x + 90.25 + x2 = 201.25 + 90.25

Reorder the terms:
90.25 + 19x + x2 = 201.25 + 90.25

Combine like terms: 201.25 + 90.25 = 291.5
90.25 + 19x + x2 = 291.5

Factor a perfect square on the left side:
(x + 9.5)(x + 9.5) = 291.5

Calculate the square root of the right side: 17.073371079

Break this problem into two subproblems by setting 
(x + 9.5) equal to 17.073371079 and -17.073371079.

Subproblem 1

x + 9.5 = 17.073371079 Simplifying x + 9.5 = 17.073371079 Reorder the terms: 9.5 + x = 17.073371079 Solving 9.5 + x = 17.073371079 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9.5' to each side of the equation. 9.5 + -9.5 + x = 17.073371079 + -9.5 Combine like terms: 9.5 + -9.5 = 0.0 0.0 + x = 17.073371079 + -9.5 x = 17.073371079 + -9.5 Combine like terms: 17.073371079 + -9.5 = 7.573371079 x = 7.573371079 Simplifying x = 7.573371079

Subproblem 2

x + 9.5 = -17.073371079 Simplifying x + 9.5 = -17.073371079 Reorder the terms: 9.5 + x = -17.073371079 Solving 9.5 + x = -17.073371079 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9.5' to each side of the equation. 9.5 + -9.5 + x = -17.073371079 + -9.5 Combine like terms: 9.5 + -9.5 = 0.0 0.0 + x = -17.073371079 + -9.5 x = -17.073371079 + -9.5 Combine like terms: -17.073371079 + -9.5 = -26.573371079 x = -26.573371079 Simplifying x = -26.573371079

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.573371079, -26.573371079}

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