If it's not what You are looking for type in the equation solver your own equation and let us solve it.
21x^2-13x-8=0
a = 21; b = -13; c = -8;
Δ = b2-4ac
Δ = -132-4·21·(-8)
Δ = 841
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{841}=29$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-13)-29}{2*21}=\frac{-16}{42} =-8/21 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-13)+29}{2*21}=\frac{42}{42} =1 $
| 2x/4+1/2=x/5+4 | | 4/3=m+4/1 | | 2(x-1)/4=2(x+3)/12 | | 26-4x=12+10x | | 10y=12y | | y/10+4=-16 | | (y-1)*(y-2)=(y-5)*(y-8) | | -6k=78 | | -8x+6(x+3)=26 | | 4x–5=31 | | 3(x-1)/5=3(x+6)/12 | | 90=5b | | 85=4x+13 | | 3x^2-2(2+5x)=-(x+5)(2-x) | | 12x+32=19-6(5/3x-1 | | 3t^2-7t-22=0 | | 2(x-2)/3=2(x+1)/6 | | 6x+4+3x=3x-14 | | (x+5)/2+(x-8)=31 | | 113=12x+5 | | -7(2x+7)=-14x+49 | | 2x-(-2/7)=5 | | (7/9)w-(13/6)=(7/2)w+(5/9) | | -25=-5/8x | | 2n+(n-9)=-41-n | | 3x^2-2x=-5x^2-3x | | w+2/5=-1/3 | | x+7/10=2/5+x−6/4 | | -2b÷13=8÷13 | | 21-1+19=x-1 | | 2x+14-34=4x-11x+4x(x-1) | | x+710=25+x−64 |