If it's not what You are looking for type in the equation solver your own equation and let us solve it.
t in (-oo:+oo)
(1/5)*t^2-9 = 0
1/5*t^2 = 9 // : 1/5
t^2 = 45
t^2 = 45 // ^ 1/2
abs(t) = 3*5^(1/2)
t = 3*5^(1/2) or t = -(3*5^(1/2))
t in { 3*5^(1/2), -(3*5^(1/2)) }
| 30w^2+115w+100= | | (x+4)(x+4)-3=13 | | -2ps-9rq+5qr+3sp=0 | | x=35-3x | | 2c^2-19c-33=0 | | 20w^2-13w-21= | | 93-4*10= | | 93-4*21= | | 3*-1+5= | | 3x-1*5= | | 20+2(x+4)=3(2x-3) | | 4*-3-2= | | x+8=3x+8 | | 8+7*-2= | | 4Y=4y^2-3 | | 2k+40=-16-2k | | x+3=1-x | | 11-x=x-7 | | n=2n-6 | | dQ=80 | | x^2+6x=124 | | 3n=4n-1 | | 1.9q-4.7-4.7q=-3.8q-1.3 | | 9x+4.5=180 | | y=3-3+2 | | y/2+3y/2+(y+10)/2=16 | | 4x+3y-2=14 | | z+18=-5 | | 8x-3(x-1)=4(x+20) | | (y+3y+y+10)/2=16 | | 4y+6x=21 | | 7.9x-1=6.9x+3 |