If it's not what You are looking for type in the equation solver your own equation and let us solve it.
2a^2+11a-21=0
a = 2; b = 11; c = -21;
Δ = b2-4ac
Δ = 112-4·2·(-21)
Δ = 289
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{289}=17$$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(11)-17}{2*2}=\frac{-28}{4} =-7 $$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(11)+17}{2*2}=\frac{6}{4} =1+1/2 $
| 14a+6a−15a−3=7 | | 3(2m-1)+5=6m+1) | | 53.973=-2.7m | | 18x+6=150 | | 4x-64=-8+32 | | 5(x−2)+7=4x−2 | | -4.2+x=-19.7 | | 120+130=x | | d-0.11=d | | -5v=90 | | M-63.28=14.92m=77.86,78.15,79.20 | | 6v=21-v | | 9x-25=5x=7 | | –3(r+10)=–9 | | 6x-9=3x+30 | | 323=-19b | | 40+6y=11y | | 12l-35=157 | | x+65=150 | | 7(x+1)+5(x+1)=5x-5 | | 1/3x^2=-x+8 | | 5x-10+3x=2(4x-5 | | 3(4x+1)=9(x-2) | | 60+35+25+x=180 | | 13x+7=6x+49 | | 0.20(x+250)=5000 | | b−3=8 | | 15v=6v+45 | | 5x+6=6x+5 | | 12-28x+12x^2=0 | | -3y=-6/5 | | 5x-10+3x=2(4x-5) |