2x^2-5x-5=0

Simple and best practice solution for 2x^2-5x-5=0 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for 2x^2-5x-5=0 equation:


Simplifying
2x2 + -5x + -5 = 0

Reorder the terms:
-5 + -5x + 2x2 = 0

Solving
-5 + -5x + 2x2 = 0

Solving for variable 'x'.

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

Divide each side by '2'.
-2.5 + -2.5x + x2 = 0

Move the constant term to the right:

Add '2.5' to each side of the equation.
-2.5 + -2.5x + 2.5 + x2 = 0 + 2.5

Reorder the terms:
-2.5 + 2.5 + -2.5x + x2 = 0 + 2.5

Combine like terms: -2.5 + 2.5 = 0.0
0.0 + -2.5x + x2 = 0 + 2.5
-2.5x + x2 = 0 + 2.5

Combine like terms: 0 + 2.5 = 2.5
-2.5x + x2 = 2.5

The x term is -2.5x.  Take half its coefficient (-1.25).
Square it (1.5625) and add it to both sides.

Add '1.5625' to each side of the equation.
-2.5x + 1.5625 + x2 = 2.5 + 1.5625

Reorder the terms:
1.5625 + -2.5x + x2 = 2.5 + 1.5625

Combine like terms: 2.5 + 1.5625 = 4.0625
1.5625 + -2.5x + x2 = 4.0625

Factor a perfect square on the left side:
(x + -1.25)(x + -1.25) = 4.0625

Calculate the square root of the right side: 2.015564437

Break this problem into two subproblems by setting 
(x + -1.25) equal to 2.015564437 and -2.015564437.

Subproblem 1

x + -1.25 = 2.015564437 Simplifying x + -1.25 = 2.015564437 Reorder the terms: -1.25 + x = 2.015564437 Solving -1.25 + x = 2.015564437 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = 2.015564437 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = 2.015564437 + 1.25 x = 2.015564437 + 1.25 Combine like terms: 2.015564437 + 1.25 = 3.265564437 x = 3.265564437 Simplifying x = 3.265564437

Subproblem 2

x + -1.25 = -2.015564437 Simplifying x + -1.25 = -2.015564437 Reorder the terms: -1.25 + x = -2.015564437 Solving -1.25 + x = -2.015564437 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.25' to each side of the equation. -1.25 + 1.25 + x = -2.015564437 + 1.25 Combine like terms: -1.25 + 1.25 = 0.00 0.00 + x = -2.015564437 + 1.25 x = -2.015564437 + 1.25 Combine like terms: -2.015564437 + 1.25 = -0.765564437 x = -0.765564437 Simplifying x = -0.765564437

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.265564437, -0.765564437}

See similar equations:

| 2x^2-38x=7x^2-3x-24 | | 9p^2+18p=10 | | x^2-5x=6 | | 2x^2-4=-204 | | 2x^2-8=-170 | | x(5x+10)=2x^2-3x+30 | | 8x^2-8x-1=0 | | 2x^2-9x-2=0 | | 2x^2=10x+3 | | y^2-4y+8=0 | | 42t^2-13tv-42v^2= | | 6s^2-13s+6= | | 2w^2+9w+9= | | 4x^7-20x^5+16x^8= | | x^2-16=0 | | x^2=81 | | 3x^2+6x=0 | | x^2-7x=0 | | y^2+6y+8=0 | | 5x^4+31x^2+6=0 | | x^2-10-4x-11=0 | | 5x^3+(2x-12)=1 | | m^2-6m+8=0 | | m^2+10m+9=0 | | m^2+5m+6=0 | | 5x^2+10x+5=180 | | 6(1+8x^3)=9 | | x^3+6x^2=4x+24 | | 5x^2-7x+2=0 | | 2x^2-11x+15=0 | | 4x^2=12x | | 8x^2=72x |

Equations solver categories