If it's not what You are looking for type in the equation solver your own equation and let us solve it.
Simplifying
2x2 + -81 = 9
Reorder the terms:
-81 + 2x2 = 9
Solving
-81 + 2x2 = 9
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '81' to each side of the equation.
-81 + 81 + 2x2 = 9 + 81
Combine like terms: -81 + 81 = 0
0 + 2x2 = 9 + 81
2x2 = 9 + 81
Combine like terms: 9 + 81 = 90
2x2 = 90
Divide each side by '2'.
x2 = 45
Simplifying
x2 = 45
Take the square root of each side:
x = {-6.708203933, 6.708203933}
| (X+1)=5X+10 | | 3x+11=5+2x | | 2n^2+15n+18=0 | | 11d-20=8-3d | | 5m+7=4m+11 | | 10s+2=4s+20 | | 3b-3=5-b | | 3x+68=7 | | -1/3x-4/3(-5+22/5)=-3 | | 3a+1=2a+3 | | 6k-2=2k+6 | | Y=-0.4(2) | | 4q-1=2+q | | =7ln(2x)dx | | -1/3-4/3(-5x+26/10)=-3 | | 1.5/6=n/18 | | 4/5x-8=20 | | 10x+2=4(x-1)+24 | | y=.75x+9.00 | | 7x(-2)-4y=12 | | 2x+2=62.5 | | −2⋅cos(x−pi/4)⋅sin(x−pi/4)=0 | | −2⋅cos(x−π/4)⋅sin(x−π/4)=0 | | 80+12h=40+15h | | 0.6y+.9=-2.1y-6.3 | | 0=2x^2-4.8x | | 2(3x)(4)= | | 3(x-3)=5+4x | | 8x+(2x+2x)=90000 | | 10-2(4x+2)= | | 7y=-7y-14 | | 15/60=x/75 |