If it's not what You are looking for type in the equation solver your own equation and let us solve it.
8x^2+13x-21=0
a = 8; b = 13; c = -21;
Δ = b2-4ac
Δ = 132-4·8·(-21)
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$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(13)-29}{2*8}=\frac{-42}{16} =-2+5/8 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(13)+29}{2*8}=\frac{16}{16} =1 $
| -4y=-100 | | 6x+7=13+x | | 1/5=k+5/6 | | -6(8a-60)=180 | | -6(8a-60=180 | | 16d=-32 | | 6x+1÷2=8 | | x=2=5x | | -9x+9=-6(x+3) | | 7x2-13x+6=0 | | 6x-43=180 | | 6(2x-8)-3=6(x-3)+9 | | 2z-4-z=11 | | -x2-4x+5=0 | | 82=10-4n | | 2x+7+x=3-9x-8 | | (-6x)+9=(-4x)-3 | | 2(a+7)-7=12 | | -6+9=(-4x)-3 | | -9h=78 | | 51-56=44x | | 6(h=4)+-2 | | 2/4y=2 | | x−2=−12 | | 25=+1.25r | | 3y+1=63 | | 200m-75m+53075=55550-150m | | 3x+6=1/3 | | x*305-(x-50+150)=34800 | | 4.9x^2+18.1x=0 | | 9^(3x^2)=80 | | D=9/7(m-29) |