9w2=81

Simple and best practice solution for 9w2=81 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 9w2=81 equation:



9w^2=81
We move all terms to the left:
9w^2-(81)=0
a = 9; b = 0; c = -81;
Δ = b2-4ac
Δ = 02-4·9·(-81)
Δ = 2916
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$w_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$w_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{2916}=54$
$w_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-54}{2*9}=\frac{-54}{18} =-3 $
$w_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+54}{2*9}=\frac{54}{18} =3 $

See similar equations:

| 17−c=−5 | | 2•x+4=28/x+2•x | | 9y^2+18y+81=0 | | 2(3x+6)=84 | | 4,6x+7,2=9,2+4,1x | | 4^x-78=x | | x^2+8x+3=-1 | | -17a+9a+-13=3 | | 17z+z+-15z-4z-10z+-15=18 | | 17z+z+-15z−4z-10z+-15=18 | | c/14=30/20 | | 6r^2=12r-20=0 | | 5(m−5)=3(m+1) | | 20p-18p-p-1=14 | | 5r+19r+-15r=9 | | 2(4×-3)-8=4+2x | | 7b-9b-b=9 | | 4r+15r=-19 | | 4h-4h+2h=16 | | 2y=−8 | | -2(x+5)=18 | | 11z-3z+4z-8z=20 | | 11z−3z+4z−8z=20 | | 13r−11r=12 | | 7z+z=8 | | 5x-x/2=4 | | x^2-3x-18.2=0 | | 6d−2/11​=2d−2/13​ | | 42/60=x/100 | | 6d−2/11​=2d−213​ | | 6^4x=50 | | 4x(6-2)-5=25 |

Equations solver categories