If it's not what You are looking for type in the equation solver your own equation and let us solve it.
(x-5)(x-4)=20
We move all terms to the left:
(x-5)(x-4)-(20)=0
We multiply parentheses ..
(+x^2-4x-5x+20)-20=0
We get rid of parentheses
x^2-4x-5x+20-20=0
We add all the numbers together, and all the variables
x^2-9x=0
a = 1; b = -9; c = 0;
Δ = b2-4ac
Δ = -92-4·1·0
Δ = 81
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}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{81}=9$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-9)-9}{2*1}=\frac{0}{2} =0 $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-9)+9}{2*1}=\frac{18}{2} =9 $
| 4g-11=5 | | (180-(9x-257)-(x+19))+(9x-202)=180 | | 0=x^2-12x-35 | | 9a=6(a+18) | | -4z+-40=36 | | 2(2000-0.5y)+y=4000 | | (x-4)*(x-5)=20 | | 2.3+3.4k=71.12 | | 3/5x+4=322 | | (Y+7)(y+3)=0 | | 4p^2-12p+13=0 | | (Y+7)(y+3)=1 | | 2x^2+3x-317=0 | | 4x-6=12+3x | | 6x+34°=8x+14° | | a/9=11/13 | | 4x+12=-x+3 | | 5z-9=0 | | a/4=7/13 | | 9x-1=-x+1 | | 4x-2(x-5)=-8+5x+9 | | 400-20x=150+30x | | -13=4+d | | 12t-3=30 | | 3x-7=80 | | 23x+2x^2=16 | | 73=-6(k-7)=6(k=5) | | 12t+3=30 | | 47=7r−9 | | c^2+6c-5=0 | | 15q+18=9q | | 8(2h+5)=2(3h+5 |