If it's not what You are looking for type in the equation solver your own equation and let us solve it.
4x^2+7x-84=0
a = 4; b = 7; c = -84;
Δ = b2-4ac
Δ = 72-4·4·(-84)
Δ = 1393
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{-(7)-\sqrt{1393}}{2*4}=\frac{-7-\sqrt{1393}}{8} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(7)+\sqrt{1393}}{2*4}=\frac{-7+\sqrt{1393}}{8} $
| 2c-9=-1 | | x=2(180-x)-100=17 | | 8+10=15y/2 | | 0=3w^2+13w+4 | | 6a=30a+35 | | 10.1x–9=5x–9+5.1x | | 13x-9=19+x | | u+30=2u | | 8x+10=15/2 | | 1/2k-1/4=3/28 | | 5y+8=5y+8 | | 4m+3m-2m=205 | | -14t-63=-147 | | x=2(90-x)-6=124 | | -4n-8=4(=3n+2) | | q/3+-5=-9 | | c/7− 2=1 | | -4n-8=4(=3n+2 | | c7− 2=1 | | 6(x-5)+12=x-(18-5x) | | 5r-10=-85 | | 4v=v+42 | | 1/2(8c-16)=20 | | 2w-22=18 | | Y=-3/9x+9 | | 4z-11=-3z+10 | | x=2(90-x)-124+6 | | X+130/y+170=1 | | 5(r+2)=75 | | x+90+65=180 | | 5f-35=-65 | | a÷4=14 |