x^2-18x-27=0

Simple and best practice solution for x^2-18x-27=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^2-18x-27=0 equation:


Simplifying
x2 + -18x + -27 = 0

Reorder the terms:
-27 + -18x + x2 = 0

Solving
-27 + -18x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '27' to each side of the equation.
-27 + -18x + 27 + x2 = 0 + 27

Reorder the terms:
-27 + 27 + -18x + x2 = 0 + 27

Combine like terms: -27 + 27 = 0
0 + -18x + x2 = 0 + 27
-18x + x2 = 0 + 27

Combine like terms: 0 + 27 = 27
-18x + x2 = 27

The x term is -18x.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18x + 81 + x2 = 27 + 81

Reorder the terms:
81 + -18x + x2 = 27 + 81

Combine like terms: 27 + 81 = 108
81 + -18x + x2 = 108

Factor a perfect square on the left side:
(x + -9)(x + -9) = 108

Calculate the square root of the right side: 10.392304845

Break this problem into two subproblems by setting 
(x + -9) equal to 10.392304845 and -10.392304845.

Subproblem 1

x + -9 = 10.392304845 Simplifying x + -9 = 10.392304845 Reorder the terms: -9 + x = 10.392304845 Solving -9 + x = 10.392304845 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = 10.392304845 + 9 Combine like terms: -9 + 9 = 0 0 + x = 10.392304845 + 9 x = 10.392304845 + 9 Combine like terms: 10.392304845 + 9 = 19.392304845 x = 19.392304845 Simplifying x = 19.392304845

Subproblem 2

x + -9 = -10.392304845 Simplifying x + -9 = -10.392304845 Reorder the terms: -9 + x = -10.392304845 Solving -9 + x = -10.392304845 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + x = -10.392304845 + 9 Combine like terms: -9 + 9 = 0 0 + x = -10.392304845 + 9 x = -10.392304845 + 9 Combine like terms: -10.392304845 + 9 = -1.392304845 x = -1.392304845 Simplifying x = -1.392304845

Solution

The solution to the problem is based on the solutions from the subproblems. x = {19.392304845, -1.392304845}

See similar equations:

| 1/5-1/8 | | 2x/5-x=x/10-35/2 | | -85z=35 | | 1/2x+18=x | | y-2=3(x+2) | | x+6y=38 | | -x-29=13+12 | | -3(6x+9)=-225 | | t^2+9t-22=0 | | 1/2c-1/4=-2/4 | | y=2(-3)+2 | | -4=8/9-19 | | 4x+x+33x+35=0 | | 4x/9=x/8+23 | | 2/28+1/49 | | 13-4x=15-3x | | 2b^2=-3b-1 | | 14x+557+43x=44x-230x | | 64=h-30 | | x/10=x/11-7 | | 2(-6+5x)=98 | | x-5=37 | | -7(2x+4)=84 | | 2/3w=40 | | 2/x=4/12 | | 45x+1250=1700 | | 11-2=15y+14 | | -9(x+3)=36 | | 9x+7=6x+40 | | -8/(-4)*(-10) | | 1000=111.0883*x | | 7(-8+5x)=-301 |

Equations solver categories