If it's not what You are looking for type in the equation solver your own equation and let us solve it.
3-Y2-21Y+45=0
We add all the numbers together, and all the variables
-1Y^2-21Y+48=0
a = -1; b = -21; c = +48;
Δ = b2-4ac
Δ = -212-4·(-1)·48
Δ = 633
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$Y_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$Y_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-21)-\sqrt{633}}{2*-1}=\frac{21-\sqrt{633}}{-2} $$Y_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-21)+\sqrt{633}}{2*-1}=\frac{21+\sqrt{633}}{-2} $
| -12-3n=-18 | | -3-6n=-15 | | 3/4p+6=12 | | r^2-50r+200=0 | | Y2-y-12=0 | | -3-6n=15 | | 7-3n=21 | | 30x-13x=17 | | 3n+2+5n-7=11 | | 19x+(-13x)+(-x)-11x-(-9x)=-9 | | 105+(5x−70)=180 | | 19x-(-13x)+(-x)-11x-(-9x)=-9 | | 19x-18x-x+3x=18 | | 7/2×-5/3=-5/6x-4/5 | | 9x+x+2x-x-7x+2=14 | | 3-6n=15 | | 6x-6x+x+2x=12 | | 12x-5x-7x+x=12 | | (-12x)+9x+(-17x)+(-5x)-(-7x)=18 | | 4.6a=-13.34 | | (-7x)-(-9x)+(-5x)+13x=20 | | 15x+x-5x+4x-5x+2=12 | | -15x-(-17x)+(-3x)+(-18)=1 | | -9x+17x-(-16)=-16 | | 11x+4x-12x-3=12 | | X+3x-2x+x+4x=7 | | 6x-11x+3x-(-7x)=-15 | | Y×.26=x | | 3x–5=23x–9 | | X=y×.26 | | -22+4y=-46 | | 854700-x=0.1x |