If it's not what You are looking for type in the equation solver your own equation and let us solve it.
2x^2-21x-17=0
a = 2; b = -21; c = -17;
Δ = b2-4ac
Δ = -212-4·2·(-17)
Δ = 577
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-21)-\sqrt{577}}{2*2}=\frac{21-\sqrt{577}}{4} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-21)+\sqrt{577}}{2*2}=\frac{21+\sqrt{577}}{4} $
| 1/3n+n=36 | | -3.2=12.3+1.4m | | -1/4=1/3x | | 2.5/8=x/10 | | G^2-14g=-49 | | 8.2÷n=0.82 | | 500=v(10)+1/2(2)(10)^2 | | 4x(2x-4)=7 | | -2x-14=-2(x-) | | 9÷x+2=-4 | | 3x-44=13 | | 87.5=3x+50 | | 133=-5x-6(7x+17) | | 180=123(x-2)+(x-3) | | 1/4=1/3x | | y=3(12.5)+50 | | -x/5-10=-7 | | -3x+7=5-(8x+7) | | 4y-20=-4(5-y) | | 500=v(10)+1/2 | | 3x-4.5=6.3 | | -6+p=-22 | | -6(x-7)-2x=-7(x+6)-3 | | 500=v×10+1/2 | | 7-5x=6x+8 | | -6+p=-2 | | 3x-3(-3x+17)=-183 | | 1.3a−0.3a+7.9=−2.4 | | 4=21/2y=31/2 | | 4/x-4-5/x-2=4/7 | | z-1/2=3/2 | | -3=m-14 |