x^2-3x-240=0

Simple and best practice solution for x^2-3x-240=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^2-3x-240=0 equation:


Simplifying
x2 + -3x + -240 = 0

Reorder the terms:
-240 + -3x + x2 = 0

Solving
-240 + -3x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '240' to each side of the equation.
-240 + -3x + 240 + x2 = 0 + 240

Reorder the terms:
-240 + 240 + -3x + x2 = 0 + 240

Combine like terms: -240 + 240 = 0
0 + -3x + x2 = 0 + 240
-3x + x2 = 0 + 240

Combine like terms: 0 + 240 = 240
-3x + x2 = 240

The x term is -3x.  Take half its coefficient (-1.5).
Square it (2.25) and add it to both sides.

Add '2.25' to each side of the equation.
-3x + 2.25 + x2 = 240 + 2.25

Reorder the terms:
2.25 + -3x + x2 = 240 + 2.25

Combine like terms: 240 + 2.25 = 242.25
2.25 + -3x + x2 = 242.25

Factor a perfect square on the left side:
(x + -1.5)(x + -1.5) = 242.25

Calculate the square root of the right side: 15.564382416

Break this problem into two subproblems by setting 
(x + -1.5) equal to 15.564382416 and -15.564382416.

Subproblem 1

x + -1.5 = 15.564382416 Simplifying x + -1.5 = 15.564382416 Reorder the terms: -1.5 + x = 15.564382416 Solving -1.5 + x = 15.564382416 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = 15.564382416 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = 15.564382416 + 1.5 x = 15.564382416 + 1.5 Combine like terms: 15.564382416 + 1.5 = 17.064382416 x = 17.064382416 Simplifying x = 17.064382416

Subproblem 2

x + -1.5 = -15.564382416 Simplifying x + -1.5 = -15.564382416 Reorder the terms: -1.5 + x = -15.564382416 Solving -1.5 + x = -15.564382416 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '1.5' to each side of the equation. -1.5 + 1.5 + x = -15.564382416 + 1.5 Combine like terms: -1.5 + 1.5 = 0.0 0.0 + x = -15.564382416 + 1.5 x = -15.564382416 + 1.5 Combine like terms: -15.564382416 + 1.5 = -14.064382416 x = -14.064382416 Simplifying x = -14.064382416

Solution

The solution to the problem is based on the solutions from the subproblems. x = {17.064382416, -14.064382416}

See similar equations:

| x(x+1)+(x+3)(x+1)=2x(x+3) | | -x-14(2+x)=4x | | X+150=60-13 | | 7x-19=-51+3x | | 5-24/7= | | 13b-2b^2=6 | | 25/9=100/x | | 18+4b= | | t/0.12=0.5/0.3 | | 3b-2b^2=6 | | 18-4b= | | 7t-15=9+t | | 7/9=p/16 | | 10/18=q/16 | | 3x-35=9x-56 | | X+52=39-17 | | 10/8=q/16 | | X+30=44-9 | | (8t+30)+(-2+-16)=22 | | X+15=28-14 | | 1/x-2=8x | | (5x^2+3x-2)(x+7)= | | 3+23=x+11 | | (7a+3)+(-a-5)=6 | | 2/8=4/m | | 3m^2-41m+84=0 | | 16x+2=68 | | (3x+45)=180 | | (3x+45)=89 | | 16-3(6x-3)=-2 | | 5(-5+4x)=115 | | 3x-9+6x=15x-15+3 |

Equations solver categories