If it's not what You are looking for type in the equation solver your own equation and let us solve it.
-7d^2+2d+9=0
a = -7; b = 2; c = +9;
Δ = b2-4ac
Δ = 22-4·(-7)·9
Δ = 256
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$d_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$d_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{256}=16$$d_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(2)-16}{2*-7}=\frac{-18}{-14} =1+2/7 $$d_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(2)+16}{2*-7}=\frac{14}{-14} =-1 $
| -2x-1=13 | | x13+5=7 | | 13x+20-9x-2=30 | | 2(u+5)=16 | | G=-3/4x | | q13+17=20 | | 17x-4(2x-5)=25+8x | | 19x-2(4x-6)=12+11x | | 10+d=3 | | -2x+4(5-7x)=-10(x-6) | | 8=-4x=-4 | | d+-3=-8 | | 19(r+1)=19 | | 3^(x-4)=45 | | -22x-9=-4(6x+3) | | 14x-3(2x-7)=20+6x | | 6.8m+35.06=-3.5(m-0.6) | | 4q+10=14 | | 3y-10=-4 | | 42/5+k=32/111 | | 4=3y=10 | | 1=-8/x | | 4(1-4x)=-36-6x | | X-5/2x8=3x | | n-10/5=4 | | -9a=37 | | w+11/6=27/8 | | (-5n)-5n-5=5 | | 18+8u=11u | | 3(4x+7)=2x-4 | | 2-2x+3x/6=2 | | 5n+18=n-54. |