If it's not what You are looking for type in the equation solver your own equation and let us solve it.
(w+20)w=400
We move all terms to the left:
(w+20)w-(400)=0
We multiply parentheses
w^2+20w-400=0
a = 1; b = 20; c = -400;
Δ = b2-4ac
Δ = 202-4·1·(-400)
Δ = 2000
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$w_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$w_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{2000}=\sqrt{400*5}=\sqrt{400}*\sqrt{5}=20\sqrt{5}$$w_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(20)-20\sqrt{5}}{2*1}=\frac{-20-20\sqrt{5}}{2} $$w_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(20)+20\sqrt{5}}{2*1}=\frac{-20+20\sqrt{5}}{2} $
| 21.5=5w | | 2a^+6a+9=0 | | 3x+9-x=10x+4 | | 2a^+6a^+9=0 | | 2a^+6a^2+9=0 | | 5x+42=99 | | -6-6v=4v+75 | | (4x-8)(11x+55)=0 | | 0=0+5*t-0.5*9.81*t^2 | | 10x+4=3x+9-x | | -8-6=3x | | Z^2+7z-12=z^2+3z+8 | | 16+6x=8x+8 | | 21=11-i | | x/7-3x/2=4 | | 17=t+85 | | 3/4x-1=6 | | 36=b+68 | | j+88=103 | | 2x+14=4x+12 | | 7x-19=3x+15 | | 2z+11=7z-25 | | z^2+7z-12=z2+3z+8 | | 10x=459 | | j+88=10 | | -19+14x=205 | | -3(-5-2z)=72 | | u+-4=-33 | | 4x-1.3=x+3.2=5x-0.2 | | 10=(2x)-4 | | 243-w=55 | | 1-8n=-14-5n |