x^2-x-100=0

Simple and best practice solution for x^2-x-100=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-x-100=0 equation:


Simplifying
x2 + -1x + -100 = 0

Reorder the terms:
-100 + -1x + x2 = 0

Solving
-100 + -1x + x2 = 0

Solving for variable 'x'.

Begin completing the square.

Move the constant term to the right:

Add '100' to each side of the equation.
-100 + -1x + 100 + x2 = 0 + 100

Reorder the terms:
-100 + 100 + -1x + x2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + -1x + x2 = 0 + 100
-1x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
-1x + x2 = 100

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 = 100 + 0.25

Reorder the terms:
0.25 + -1x + x2 = 100 + 0.25

Combine like terms: 100 + 0.25 = 100.25
0.25 + -1x + x2 = 100.25

Factor a perfect square on the left side:
(x + -0.5)(x + -0.5) = 100.25

Calculate the square root of the right side: 10.012492197

Break this problem into two subproblems by setting 
(x + -0.5) equal to 10.012492197 and -10.012492197.

Subproblem 1

x + -0.5 = 10.012492197 Simplifying x + -0.5 = 10.012492197 Reorder the terms: -0.5 + x = 10.012492197 Solving -0.5 + x = 10.012492197 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 = 10.012492197 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = 10.012492197 + 0.5 x = 10.012492197 + 0.5 Combine like terms: 10.012492197 + 0.5 = 10.512492197 x = 10.512492197 Simplifying x = 10.512492197

Subproblem 2

x + -0.5 = -10.012492197 Simplifying x + -0.5 = -10.012492197 Reorder the terms: -0.5 + x = -10.012492197 Solving -0.5 + x = -10.012492197 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 = -10.012492197 + 0.5 Combine like terms: -0.5 + 0.5 = 0.0 0.0 + x = -10.012492197 + 0.5 x = -10.012492197 + 0.5 Combine like terms: -10.012492197 + 0.5 = -9.512492197 x = -9.512492197 Simplifying x = -9.512492197

Solution

The solution to the problem is based on the solutions from the subproblems. x = {10.512492197, -9.512492197}

See similar equations:

| 9+12-17x-17=4 | | 2x^2-20x+57=0 | | 3(-2+3)-3x-3=-2 | | 0=2+-0.5y | | -4y+2=-2(3y+6) | | 8y^2-22y+14=0 | | -1=2-0.5y | | 39.99+2.5x=1.75x+50.00 | | 12(2x-8)=5(5-2x)+3(7-3x) | | 39.99+2.5x=50.00+175x | | 5x-9y+7-3+8x+8x= | | 7x+3+6x=6x-9 | | 4y-36=y | | 2v-.3+6v+1.5= | | 8x+12+3y=6y-15+3x | | -4(3x-4)+3=9 | | 6x-7=-5y | | 6x-7=5y | | 4y-5-3y-3= | | 9(x+3)= | | -3x-3x+11x+12+12= | | -6+9-7x-4x-8y+5y= | | d=.5kv | | 5x+4=6(x+5) | | 7x+10(x+8)= | | 4x^2-33x+64=0 | | 11+[3x-2(1+5x)]= | | 9000000+200000x=5000000x | | M-2.25=4.5 | | 2(-1+3)-4=3(-1)+3 | | 5(-4x-8)=1 | | -3(3+3)=-3(x+1)-5 |

Equations solver categories