r^2-15r=0

Simple and best practice solution for r^2-15r=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 r^2-15r=0 equation: 



r^2-15r=0

a = 1; b = -15; c = 0;
Δ = b2-4ac
Δ = -152-4·1·0
Δ = 225
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{225}=15$


$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-15)-15}{2*1}=\frac{0}{2}
=0
$


$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-15)+15}{2*1}=\frac{30}{2}
=15
$

See similar equations:

| -9/5=-4/3v-5/2 | | 7m+5=2m+8 | | (y-7)^2=54 | | x-11=(-14) | | 3-6x=2x+11 | | 3c+15=27 | | -8(x+6)=4(x-7) | | 8x+180=180 | | f/5(13)=12 | | 3k+10=5k-4 | | -28=-x+7x+8 | | (1/64)=2^(16a) | | –2t=–t+8 | | 4z-10=7z+8 | | 5+8x=6.50+5x | | 2x+3=-25+6x | | 1.3x-11=3 | | 150+8x=200+6x | | -9+6c=5c | | |8x-2|-4=18 | | -17f-20=10-2-15f | | (n-2)(180)=156(n) | | x/3.5+7.4=8 | | -10+3p=-3p+8 | | 63=(1+4b) | | 6.3+v/3=-1.2 | | 14z+20+6z=8z-16 | | 4m=–4+5m | | -5t-9=4t | | -8z+6=-7z | | x=4(2x+3)=15 | | x/3=4/3-9 |

Equations solver categories