If it's not what You are looking for type in the equation solver your own equation and let us solve it.
X^2-3X-900=0
a = 1; b = -3; c = -900;
Δ = b2-4ac
Δ = -32-4·1·(-900)
Δ = 3609
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}$$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{3609}=\sqrt{9*401}=\sqrt{9}*\sqrt{401}=3\sqrt{401}$$X_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-3)-3\sqrt{401}}{2*1}=\frac{3-3\sqrt{401}}{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-3)+3\sqrt{401}}{2*1}=\frac{3+3\sqrt{401}}{2} $
| -40+7r=-5(8+5r) | | x+66+69=180 | | 8(1-4r)=-8r+8 | | 2x²+13x+15=0 | | 10+2x=-38 | | x=4.6+13.18 | | x+63+45=180 | | 2x^2+16x=12 | | 3-2x+8=-1 | | 3x+1=-28 | | 64=100x | | 0.035=64=x=100 | | (2x*x)+50=850 | | 7-9m=-1 | | 5x2+340x-600=0 | | 2x+2(2/3)x=38 | | -0.25x^2+14x+86=50 | | 5a^2+2=22 | | (1+h)(4)= | | 5m+8=14-3 | | -2(x+5) ÷5=6 | | 1v+1=2 | | 3+–1r=1 | | 2x+3=20x= | | k=8= | | (x+4)^2=4^2 | | v=12403-12403(.09)(1.75) | | 4x^2-32=5x^2+18x | | 10/6=0.04x | | m1+75=180 | | 4x-3(4x-14)=15 | | 8÷2(x+x)=16 |