d^2-21d=0

Simple and best practice solution for d^2-21d=0 equation. Check how easy it is, and learn it for the future. Our solution is simple, and easy to understand, so don`t hesitate to use it as a solution of your homework.

If it's not what You are looking for type in the equation solver your own equation and let us solve it.

Solution for d^2-21d=0 equation: 



d^2-21d=0

a = 1; b = -21; c = 0;
Δ = b2-4ac
Δ = -212-4·1·0
Δ = 441
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$d_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$d_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{441}=21$


$d_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-21)-21}{2*1}=\frac{0}{2}
=0
$


$d_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-21)+21}{2*1}=\frac{42}{2}
=21
$

See similar equations:

| 3(4f-2)=2(4f+1) | | y=0.5(60)(2)^2 | | 10=-10x+4 | | n-6=2n-6 | | 51x-185=427 | | -3x-17=3x-15 | | 51-(5x+7)=4(x+6)+x | | 1/4x^2+3/2x-2=0 | | 0=(x-6^2)-25 | | 12x^2+72x-84=0 | | 36-2x/5x=1 | | 2x+2x=420 | | 22(3x+3)=132 | | 22(3x-2)=22 | | 94-62x=89 | | 22(3x+3)=22 | | 5x-5=2(3x+11)+8x | | 78=6h | | ×(x-5)=50 | | 62x-94=89 | | 5x-5=4x+11 | | 5(5)=2x+7 | | 2*(4x+5)-5x=4-3*(x-5) | | 5*2y-1=45 | | 28x-154=42 | | 22(5x-2)=66 | | 22(5x-2x)=66 | | 2(3+2p)=22 | | 5x-20-15x=2x-10 | | -5=-5+k | | 7(x+10=-77 | | 4y+3=32y+8 |

Equations solver categories