x2-x-90=0

Simple and best practice solution for x2-x-90=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 x2-x-90=0 equation:



x2-x-90=0
We add all the numbers together, and all the variables
x^2-1x-90=0
a = 1; b = -1; c = -90;
Δ = b2-4ac
Δ = -12-4·1·(-90)
Δ = 361
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{361}=19$
$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-1)-19}{2*1}=\frac{-18}{2} =-9 $
$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-1)+19}{2*1}=\frac{20}{2} =10 $

See similar equations:

| 3/53/5(2m-10)=2/3m+10 | | 2(10+v)-v=17 | | -2(-6r+6)-7r=12 | | 2x^2-24=-2 | | 5s-4s-s+3s+4s=14 | | -6.5=p+3.9p | | 3w-27=12+2w | | 8+(11/x)=(84/x^2) | | 1/7-x+1/8=x/7 | | 308=7(6m+8) | | -57+9q=-10q | | 1/x^2+4x-21=1/x+3+3/x^2-9 | | 4+2/3x=2/5 | | 0=1/4x-1 | | (13x-1)^2-2(13x-1)-3=0 | | -6.5=p+3.9p= | | 3x+-3=4 | | -3/5-1/3w=-5/4 | | (5/x+3)=(-2/3x-1) | | 10(x-7)^2=440 | | 4x+61/2x+2=65 | | 8b+6=4b-12 | | 8m-5m=6 | | (14x-41)+(9x-32)=180 | | 7x-15=7-4 | | 8n-n=7 | | 21x=55 | | (9x+4)+(6-7x)=0 | | 6x^2+24x+24x-96=-138 | | 11y/10+2=9y/8 | | -7(-3-5n)=266 | | 6x^2+24x+24x-96=138 |

Equations solver categories