If it's not what You are looking for type in the equation solver your own equation and let us solve it.
3x^2+9=81
We move all terms to the left:
3x^2+9-(81)=0
We add all the numbers together, and all the variables
3x^2-72=0
a = 3; b = 0; c = -72;
Δ = b2-4ac
Δ = 02-4·3·(-72)
Δ = 864
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{864}=\sqrt{144*6}=\sqrt{144}*\sqrt{6}=12\sqrt{6}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-12\sqrt{6}}{2*3}=\frac{0-12\sqrt{6}}{6} =-\frac{12\sqrt{6}}{6} =-2\sqrt{6} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+12\sqrt{6}}{2*3}=\frac{0+12\sqrt{6}}{6} =\frac{12\sqrt{6}}{6} =2\sqrt{6} $
| -1.8+0.7r=14.3 | | C+2c-1=188 | | (8x-12)+(6x+8)=180 | | 55.125+7.5y=15 | | 5/6x+5=70 | | -y-3-y=-11 | | 2r−6=4 | | 10,000(x)=x(-20x+1200) | | –y–3–y=–11 | | (X)=0.5x^-10x+600 | | 10+2y=-34 | | x=(5x) | | 10,000=x(-20x+1200) | | -11=-4/3(-5)+b | | 6=2p−4 | | 10+5b=95 | | -2.5=-0.5(x-7.1) | | 2^x+1=3^(x/2) | | -10=4/3(6)+b | | X2-1.98x+1.52=0 | | 5x+4+x-2=3x+7 | | 15x.75=26.25 | | 1-x/2=12 | | -15=-3(-8)+b | | -3x1=x+9 | | 15=-3(-8)+b | | v=10=49 | | 3+t=12 | | x8=38 | | −4(x+1)+11=−21 | | 6e-4=3e+14 | | x=5/28/10 |