If it's not what You are looking for type in the equation solver your own equation and let us solve it.
280=-5t^2
We move all terms to the left:
280-(-5t^2)=0
We get rid of parentheses
5t^2+280=0
a = 5; b = 0; c = +280;
Δ = b2-4ac
Δ = 02-4·5·280
Δ = -5600
Delta is less than zero, so there is no solution for the equation
| (x+10)(104)=180 | | a/2=5=25 | | x(8x+4)=0 | | 150-1.5x=2.5x | | 2(x+1)^(3/2)=-54 | | s/4− 2=1 | | (4/3)x=(10/3) | | –13=r/3− 17 | | y=2×+44 | | v/3+ 7=10 | | –w=–4−5w | | 8x(8+7)=120 | | 2(x-4)=-4+10 | | 8x^2+13-19=4x-11 | | 3t4=40 | | −12=4+7x+9x | | 4(1+5x)=6+2(12+x)+4x | | 4xX+31=75 | | 4x(3x6)=(4x)x6 | | 3(-5)-8y=1 | | 4(x+8-4=15x+6 | | 6p×(–2)=144 | | 3∛(2x+6)=18 | | 8+9g=–9g−10 | | 4x-x=3x3x | | `9000x^{2}-6000x-15000=0` | | 2(c-5)=300 | | -7i=-21i | | 3.5d=70= | | h−12=74 | | h/4=-3.9 | | Y=10000(0.65(x |