If it's not what You are looking for type in the equation solver your own equation and let us solve it.
10x^2-21x+9=0
a = 10; b = -21; c = +9;
Δ = b2-4ac
Δ = -212-4·10·9
Δ = 81
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{81}=9$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-21)-9}{2*10}=\frac{12}{20} =3/5 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-21)+9}{2*10}=\frac{30}{20} =1+1/2 $
| 6(x+3)+2=5(1-x)+8 | | u/6-2=2 | | 0.1n=25+0.05(n−200) | | #x+@x=457 | | $0.99-$24t=$1.00+$1.49 | | y/2+4=15 | | 6+4b-7=4b | | -30+3x=33-4x | | 4(3x+2)=14x+7-2x+1 | | 16y2-48y=0 | | $0.99-$24t=1+$1.49 | | 7=3.5k | | 40=12×w | | 13x+3=1x-3 | | 4(3x-2)+7=2 | | 5(x+2)+x=22 | | (4t+1)/(8-t)=1.3 | | 3(2t-4)=7t+12-t | | 12+5r=1-6r | | 7M=9(m+4 | | 8(3c-5)=7(c-8)-1 | | 0.6x+0.6=0.9x-1.8 | | 6-5x-x^2=3x+13 | | 3(3-b)=5(2b+7) | | 5=3c= | | 4t+21=93 | | 6m-12=8m+4 | | 9(d+7)=225 | | 144=2(3w)+2w | | 2(x-5)+3=6x-4(1+x) | | 17-2p-5/4=p | | X-15+3x=180 |