If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-405+5x^2=0
a = 5; b = 0; c = -405;
Δ = b2-4ac
Δ = 02-4·5·(-405)
Δ = 8100
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{8100}=90$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-90}{2*5}=\frac{-90}{10} =-9 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+90}{2*5}=\frac{90}{10} =9 $
| 7x-8=8+3x-21+3x | | 4y+9=53 | | (-3-4x)^1/2-(-2-2x)^1/2=1 | | 3|8-4x5|+9=x | | 7x-8=8+14x21-+3x | | 3/5g-1/4=17/20 | | 10=5/6x+6-1/6x | | 52=5v+17 | | 3^(x-2)=9^(2x) | | -6x+9+8x=-2 | | 16^(2x+1)=128 | | 7x-8=8+3x-7+3x | | 8x+14-6x-19=2 | | 5(1-2(x+2)=4 | | 7x-8=8+5x-8+3x | | 7x-8=8+5x-3+3x | | x+1/x+7=49 | | x=8x+3÷20 | | t2–11t=0 | | 7x-8=8+2x-3+3x | | t+.0025*t=10000 | | 1+.0025*t=10000 | | 2-4(3x+36(4-24))+36×2^2=66 | | 3x^-12x=0 | | 7x-8=8+6x-5+3x | | 6c+14=-5c+4+9c | | -8+5n=3n+4 | | 4x2-9x+4=0 | | 7x-8=8+10x-12+3x | | 7x-8=8+12x-10+3x | | 7x-8=8+13x-6+3x | | 7x-8=8+14x-6+3x |