If it's not what You are looking for type in the equation solver your own equation and let us solve it.
X^2-15X-168=0
a = 1; b = -15; c = -168;
Δ = b2-4ac
Δ = -152-4·1·(-168)
Δ = 897
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{-(-15)-\sqrt{897}}{2*1}=\frac{15-\sqrt{897}}{2} $$X_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-15)+\sqrt{897}}{2*1}=\frac{15+\sqrt{897}}{2} $
| -3t+3-12=t5 | | X+y=110° | | -3t+3-12=5 | | h-7=-15 | | 2/t=8/5 | | 74=-2b-5 | | 81c=540 | | 1890-36c=1350+45c | | 3+2x=30x | | |9|=x | | 11-2a=5a | | x.−16=4−2x+7x | | 4=5(x+1)-6 | | 2k+33=11 | | 4^2+12x+9=0 | | 4x+8÷5x+8=5/6 | | (97-x/2)+x=97 | | 3y²=15y | | 2x^2-4=150 | | X°+2x°+3x°=180 | | 14-4-5=b | | 3/5x-1=2/5-3x | | 1-2x/7)-(2-3x)=3/2+x/4 | | (1-2x/7)-(2-3x)=3/2+x/4 | | -3-1=-4-2x | | 3=4/x | | 38n=266 | | x=1+2*3-8/4 | | 3^y=243 | | (3u-2)(2u-7)=0 | | 14(y-3)=4(y+2 | | X+1/2x=7.5 |