If it's not what You are looking for type in the equation solver your own equation and let us solve it.
0=x^2-17x-90
We move all terms to the left:
0-(x^2-17x-90)=0
We add all the numbers together, and all the variables
-(x^2-17x-90)=0
We get rid of parentheses
-x^2+17x+90=0
We add all the numbers together, and all the variables
-1x^2+17x+90=0
a = -1; b = 17; c = +90;
Δ = b2-4ac
Δ = 172-4·(-1)·90
Δ = 649
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{-(17)-\sqrt{649}}{2*-1}=\frac{-17-\sqrt{649}}{-2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(17)+\sqrt{649}}{2*-1}=\frac{-17+\sqrt{649}}{-2} $
| -x²+4-54=0 | | 2x+4=-x-9 | | 6(x-4)+9x=1/2(x+4)+3 | | –2(m−6)=–18 | | -12=-6(-4+2l) | | 6(x-4)+9x=1/2((+4+3 | | -16-x=9 | | (3+5)+2y=(5*8)-2*4 | | t–22=–5 | | 2q+4=–14 | | -10q+10=-8q-8 | | F(x)=-8x-9; | | 8x-5=-2x^2 | | 3(x-5)=7-2(x+1) | | 4x-17=156 | | 56=6x-1/2 | | –2.88(v−7)=–5.76 | | -1.4=0.1+x/11 | | -6=-6w+3(w-8) | | -2(3+4s)=-54 | | 34x2=68 | | 3c=-8+7c | | 0.25x+7=2(2x-4) | | x-17=156 | | 4x+5=30-1 | | 1/2x+3/4=2.1/2 | | 7^{2x}+7^x-12=0 | | 360=8x-30 | | 3x-17+x+40+2x-50=180 | | 6+2x=54+1x | | 2x^2-53x+336=0 | | y−21/4=−6 |