x^2-1x-8=0

Simple and best practice solution for x^2-1x-8=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^2-1x-8=0 equation:


Simplifying
x2 + -1x + -8 = 0

Reorder the terms:
-8 + -1x + x2 = 0

Solving
-8 + -1x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '8' to each side of the equation.
-8 + -1x + 8 + x2 = 0 + 8

Reorder the terms:
-8 + 8 + -1x + x2 = 0 + 8

Combine like terms: -8 + 8 = 0
0 + -1x + x2 = 0 + 8
-1x + x2 = 0 + 8

Combine like terms: 0 + 8 = 8
-1x + x2 = 8

The x term is -1x.  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.
-1x + 0.25 + x2 = 8 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 8 + 0.25

Combine like terms: 8 + 0.25 = 8.25
0.25 + -1x + x2 = 8.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 8.25

Calculate the square root of the right side: 2.872281323

Break this problem into two subproblems by setting 
(x + -0.5) equal to 2.872281323 and -2.872281323.

Subproblem 1

x + -0.5 = 2.872281323 Simplifying x + -0.5 = 2.872281323 Reorder the terms: -0.5 + x = 2.872281323 Solving -0.5 + x = 2.872281323 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 = 2.872281323 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 2.872281323 + 0.5 x = 2.872281323 + 0.5 Combine like terms: 2.872281323 + 0.5 = 3.372281323 x = 3.372281323 Simplifying x = 3.372281323

Subproblem 2

x + -0.5 = -2.872281323 Simplifying x + -0.5 = -2.872281323 Reorder the terms: -0.5 + x = -2.872281323 Solving -0.5 + x = -2.872281323 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 = -2.872281323 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -2.872281323 + 0.5 x = -2.872281323 + 0.5 Combine like terms: -2.872281323 + 0.5 = -2.372281323 x = -2.372281323 Simplifying x = -2.372281323

Solution

The solution to the problem is based on the solutions from the subproblems. x = {3.372281323, -2.372281323}

See similar equations:

| a^2-6ab+9b^2=0 | | 9x+14=13x+(-10) | | 3(y+4)=7x-5x+6 | | 2(3t-5)=19t+7 | | -9-7c=-5 | | 3(2c+6)=15c | | 7x=90-2x | | (6g-9)+0.3(15-9g)= | | x+7.1=39 | | X-2=78 | | b-2+6b=28 | | 10x+11x=-231 | | 14x=4x-100 | | 8x+2+22x-2=180 | | 5x^2+55+90= | | (5x+6)(x-11)=0 | | 7b+14-8b=-4(2b+5)-9b | | -x+10=15-7x-5 | | 0=x^2+21x+10 | | A=15+2B | | 3z-14=13 | | 11x-3(4x-8)=28 | | y*y*y=36y | | 4y*y-8y=0 | | 19.14+x^2+8x=144 | | -3-8=-5 | | 13x-5=12x-5 | | 18x-(5x-2)=15 | | -2(2p-5)=2(3p-20) | | -60=-3x-9 | | =(x-(1+i))(x-(1-i))(x-2) | | 3x+5=25+C |

Equations solver categories