x^2-2x-40=0

Simple and best practice solution for x^2-2x-40=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 x^2-2x-40=0 equation:


Simplifying
x2 + -2x + -40 = 0

Reorder the terms:
-40 + -2x + x2 = 0

Solving
-40 + -2x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '40' to each side of the equation.
-40 + -2x + 40 + x2 = 0 + 40

Reorder the terms:
-40 + 40 + -2x + x2 = 0 + 40

Combine like terms: -40 + 40 = 0
0 + -2x + x2 = 0 + 40
-2x + x2 = 0 + 40

Combine like terms: 0 + 40 = 40
-2x + x2 = 40

The x term is -2x.  Take half its coefficient (-1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
-2x + 1 + x2 = 40 + 1

Reorder the terms:
1 + -2x + x2 = 40 + 1

Combine like terms: 40 + 1 = 41
1 + -2x + x2 = 41

Factor a perfect square on the left side:
(x + -1)(x + -1) = 41

Calculate the square root of the right side: 6.403124237

Break this problem into two subproblems by setting 
(x + -1) equal to 6.403124237 and -6.403124237.

Subproblem 1

x + -1 = 6.403124237 Simplifying x + -1 = 6.403124237 Reorder the terms: -1 + x = 6.403124237 Solving -1 + x = 6.403124237 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = 6.403124237 + 1 Combine like terms: -1 + 1 = 0 0 + x = 6.403124237 + 1 x = 6.403124237 + 1 Combine like terms: 6.403124237 + 1 = 7.403124237 x = 7.403124237 Simplifying x = 7.403124237

Subproblem 2

x + -1 = -6.403124237 Simplifying x + -1 = -6.403124237 Reorder the terms: -1 + x = -6.403124237 Solving -1 + x = -6.403124237 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1' to each side of the equation. -1 + 1 + x = -6.403124237 + 1 Combine like terms: -1 + 1 = 0 0 + x = -6.403124237 + 1 x = -6.403124237 + 1 Combine like terms: -6.403124237 + 1 = -5.403124237 x = -5.403124237 Simplifying x = -5.403124237

Solution

The solution to the problem is based on the solutions from the subproblems. x = {7.403124237, -5.403124237}

See similar equations:

| 5(x+7)=2(2x+7) | | 5x+4=x^2-6 | | 7x-3(x+1)=-19 | | 4(10-2(-2x-5))=6x+80 | | 4x+3(x-2)=18-x | | 7n^2-15=-4n | | -2x^2+3x=0 | | 4x-5y+6=0 | | -5.4=1.5+h | | -10(58)+70x=5(x-12) | | 20+6y=16 | | 2.4x-3=4.8+1.4x | | 3n-4=8 | | 2n+1=7 | | (9r)3/2-4=725 | | 9n=25+2 | | m^2+m=56 | | 5(d+2)+3d=58 | | -5(x+2.4)-2(x-3)=-3 | | 5x=176-3x | | 3-4=y | | x-4/3=5+x | | 2+x=-1 | | 3x-2=2+4x | | 4x+12=2x-6 | | 4-2y=-4+2y | | -2(4p+1)-(3p-1)=5(3-p)-9 | | 7x-1=5x+7 | | 2(x-4)+5-8-8x=4x-9+3 | | x+8-8=1-9 | | y-3+5y=2y-5-3y | | 6x+7=1-5x |

Equations solver categories