Question

Which solution set best fit the solutions of -1.5^2+4x+2.2=0

2.2 and 3.1 or this one...
no real solution
-0.5 and 2.2
-0.5 and 3.1 <--

Answer 1

Well, why don't we solve it, probably faster than subbing in all those values

-1.5^2+4x+2.2=0
3x^2 - 8x - 4.4 = 0
x = (8 ± √116.8)/6 = appr 3.13 or -.5

you are right

Answer 2

Thank you