If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x2=81.
We move all terms to the left:
x2-(81.)=0
We add all the numbers together, and all the variables
x2-81=0
We add all the numbers together, and all the variables
x^2-81=0
a = 1; b = 0; c = -81;
Δ = b2-4ac
Δ = 02-4·1·(-81)
Δ = 324
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{324}=18$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-18}{2*1}=\frac{-18}{2} =-9 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+18}{2*1}=\frac{18}{2} =9 $
| 19=193-y | | |x+2|-7=-4 | | 59=-x+202 | | 18+4q=-3+q | | 9x-13=4x+2. | | 2(x+3)=-40 | | 7x+14°+62=15x-4° | | m=890,000(1+13.35*0.75) | | 2-1/2=3n+162−21 n=3n+16 | | m=890,000(1+13.35*0.75 | | –11t=15–6t | | m=890,000(1+13.35*9) | | -5y+10y=0 | | X+3=(10-x)÷3 | | m=890,000(1+13.35*9 | | 1/2p=-3 | | a-8=-4.5 | | t+7=−21 | | 6(x-)=30 | | 10=-2.5x | | 3(–4d+9)=–8d−9 | | 25x-3=24 | | 16=9+f | | -2x-5(6x+4)=232 | | 3x^2-8x=48 | | 4(x-1/4)=(12x-3) | | 3(4z+)=36 | | x/29=-25 | | x^2+180=-16 | | 25x-3=25 | | 3x+4(-3x-3)=-93 | | 5(a+15)=5 |