If it's not what You are looking for type in the equation solver your own equation and let us solve it.
9x^2-14x-87=0
a = 9; b = -14; c = -87;
Δ = b2-4ac
Δ = -142-4·9·(-87)
Δ = 3328
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{3328}=\sqrt{256*13}=\sqrt{256}*\sqrt{13}=16\sqrt{13}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-14)-16\sqrt{13}}{2*9}=\frac{14-16\sqrt{13}}{18} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-14)+16\sqrt{13}}{2*9}=\frac{14+16\sqrt{13}}{18} $
| 4-(2x+6)=-16 | | (×+20)(210-3x)+×=180 | | 7(20-y)+5.5y=119 | | 7x+5.5(20-x)=119 | | 42=10+x-17x | | -5(x+7)+2=2 | | 9/6=2400/x | | ((y+9)/4)=5 | | 49.4×17.7=x | | (y+9/4)=5 | | k2+26k+17=0 | | t2+10t=-21 | | x-0.35x=500 | | 63-44=x | | 1/2 r−3=3(4−3/2 r) | | 2x+21=-2x-3 | | x=-1x^2-6x+9 | | 7x^2-43x+66=0 | | 2=(8p+10) | | 2=(8p=10) | | 10x^2-43x+66=0 | | 2=(8p=0) | | x/9/20x-4/9=60 | | 16+4r=-7r+8(r-1) | | 1/3(3x-1)=-1/5-3-5 | | .4(8x+16)=1.2-(x+2) | | (-8k)=24 | | .55x=166 | | 23x+32=-14 | | 2/3(12x-6)=-4 | | -3(7x-4)=-21x-12 | | 4r-7r+7+r=0 |