If it's not what You are looking for type in the equation solver your own equation and let us solve it.
28a^2-21a=0
a = 28; b = -21; c = 0;
Δ = b2-4ac
Δ = -212-4·28·0
Δ = 441
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$$\sqrt{\Delta}=\sqrt{441}=21$$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-21)-21}{2*28}=\frac{0}{56} =0 $$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-21)+21}{2*28}=\frac{42}{56} =3/4 $
| 15=4x=1 | | y=6(-3)+8 | | 2(12x+18)+6=18x+6(x+7) | | -4w=16.16 | | 15(n+7)-81=3(5n+8) | | -13=4(-3-6c)+24c | | 51/3+x=21/2 | | -6d+10+6d=10 | | 25x+13+12x=-130 | | -7+20u=2(10u-5)+3 | | h-7=-13.9 | | 25x+58+12x=-130 | | 5t+18=2t+33 | | 5(7-2v)+0v+10v=6 | | 6-3f=7+9(4-2f) | | (356.25)=(9,500)(.025)t | | 5y+1=3y+ | | 3(x+2)=x+2(x+1) | | ((7+7+4x)-(4+4+2x))x=3.6 | | -4x-72-9x=84 | | 7+1/2(12-4s)+2s=4 | | 2x+x-20=22 | | G(x)=-8+3x | | 3x+x^2=3.6 | | 7^2(4)=9x | | 5-5=3x | | 6x+10=x+15+5x | | x=0.1x^2-0.7x+1.4 | | 18g-16g+5g=14 | | 9r+2r+4r-12r-r=16 | | -17x+-8x+14x+13x=20 | | 12q+-15q=15 |