x^2-90x-100=0

Simple and best practice solution for x^2-90x-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^2-90x-100=0 equation:


Simplifying
x2 + -90x + -100 = 0

Reorder the terms:
-100 + -90x + x2 = 0

Solving
-100 + -90x + 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 + -90x + 100 + x2 = 0 + 100

Reorder the terms:
-100 + 100 + -90x + x2 = 0 + 100

Combine like terms: -100 + 100 = 0
0 + -90x + x2 = 0 + 100
-90x + x2 = 0 + 100

Combine like terms: 0 + 100 = 100
-90x + x2 = 100

The x term is -90x.  Take half its coefficient (-45).
Square it (2025) and add it to both sides.

Add '2025' to each side of the equation.
-90x + 2025 + x2 = 100 + 2025

Reorder the terms:
2025 + -90x + x2 = 100 + 2025

Combine like terms: 100 + 2025 = 2125
2025 + -90x + x2 = 2125

Factor a perfect square on the left side:
(x + -45)(x + -45) = 2125

Calculate the square root of the right side: 46.097722286

Break this problem into two subproblems by setting 
(x + -45) equal to 46.097722286 and -46.097722286.

Subproblem 1

x + -45 = 46.097722286 Simplifying x + -45 = 46.097722286 Reorder the terms: -45 + x = 46.097722286 Solving -45 + x = 46.097722286 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + x = 46.097722286 + 45 Combine like terms: -45 + 45 = 0 0 + x = 46.097722286 + 45 x = 46.097722286 + 45 Combine like terms: 46.097722286 + 45 = 91.097722286 x = 91.097722286 Simplifying x = 91.097722286

Subproblem 2

x + -45 = -46.097722286 Simplifying x + -45 = -46.097722286 Reorder the terms: -45 + x = -46.097722286 Solving -45 + x = -46.097722286 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '45' to each side of the equation. -45 + 45 + x = -46.097722286 + 45 Combine like terms: -45 + 45 = 0 0 + x = -46.097722286 + 45 x = -46.097722286 + 45 Combine like terms: -46.097722286 + 45 = -1.097722286 x = -1.097722286 Simplifying x = -1.097722286

Solution

The solution to the problem is based on the solutions from the subproblems. x = {91.097722286, -1.097722286}

See similar equations:

| 2(5x+3)=7 | | 22x-7-13x+4=23x-9-14x+14 | | -19x-11=-11x+85 | | 68-2.5x=x+35 | | 12p=6*3p | | 3x+3=6x-5 | | 33-x=279-0.5-x+4 | | 11+7x+18x-6=180 | | 2sinx+7=8 | | 8(8x+4)-3x=276 | | 6+12=2+6x+12 | | 8h=112 | | 5y^2+y+1=0 | | -7x-15=14-8x | | 4x+3=-6x-77 | | 2x(2x+2)=6 | | 8x+5=5x-28 | | 5x+24=?36 | | 9x-(6x-3)=15 | | F-32=360 | | -3x-7=-12x+56 | | xy+yz+xz=0 | | x^8-9=8 | | 6(x-3)=12x-3 | | 11x+2=5x-70 | | y+2=-2(x+1) | | 3d+25.00=135.97 | | 666=7 | | 4u+7=3 | | -13x+8=-8+18 | | 45w+9=126 | | 16x+6=6x+86 |

Equations solver categories