If it's not what You are looking for type in the equation solver your own equation and let us solve it.
5r^2+20r+15=0
a = 5; b = 20; c = +15;
Δ = b2-4ac
Δ = 202-4·5·15
Δ = 100
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{100}=10$$r_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(20)-10}{2*5}=\frac{-30}{10} =-3 $$r_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(20)+10}{2*5}=\frac{-10}{10} =-1 $
| 6c-12=3c-12 | | (r+6)2=15 | | –x–1/4=3 | | 6=27a | | 2m+7=4m-11 | | M/5/6=36m-48 | | 3x+2(x-4)=x-12 | | 25+5y=-50 | | 24=4-5(t+2) | | 6y-4=4y+20 | | 9x+-6=16x+-4 | | 6u^2-600=0 | | 250=100x/50x | | 2(4×-5)+4×=4(5-5x)+10 | | a÷2=11 | | 17=z-(-)5 | | -25+5y=25 | | 6m/5=36m-60 | | 6y+40=94 | | 2(2x3)=5(x+6)-28 | | 6y+94=180 | | 3.6r=4r-28 | | 6+a=120 | | (M/5/6)-36m=-48 | | 4b+4b+2b=10 | | g+5=-4 | | 2b2-3b=4b(b-1) | | m-3.5=8 | | 105-7x=2x+42 | | a/15=6/15 | | k+13=103 | | 4x+52=86 |