============ eq1:= a*(1.7)^2+b*(1.7)+60=0; 2.89 a + 1.7 b + 60 = 0 eq2:=a*(3.5)^2+b*(3.5)+60=-52; 12.25 a + 3.5 b + 60 = -52 solve({eq1,eq2},[a,b]); [[a = 1.830065359, b = -38.40522876]]