If it's not what You are looking for type in the equation solver your own equation and let us solve it.
7x^2+15=0
a = 7; b = 0; c = +15;
Δ = b2-4ac
Δ = 02-4·7·15
Δ = -420
Delta is less than zero, so there is no solution for the equation
| 2p^2+7p+8=0 | | 8=x-(-1+ | | 3=-2v=v | | 11w=5w+4=360 | | (6x-4)+(3x-4)=180 | | 56x–98=−266 | | 12=0.6c | | 20/4x=5 | | 9/5f+32=68f | | M.0.07=10m | | 6b^2=–18b | | |4x+1|=|6x+1| | | −4.5=1.5−x | | 12=-44-6x–3) | | 2/3x+4=-1/4x+2 | | c/6=30/5 | | p-45=-9+p | | -28=3n+5 | | 5(5n−7)−4n=16n−5 | | y3=18 | | 12b-27=11b-32 | | 7b−2/5=6b−7/5 | | 2x−5=9 | | 9x/3-45/9+36×/6=-126/9 | | 2n+19=3n+16 | | −17*x=−204 | | 3/8x-2/5=7/4 | | 6x=500+4x | | 8+9x+3=6x+16+2x | | 25+6x=9+18x | | 4n+25=2n+29 | | 40(3/8x-2/5=7/4) |