(x+8)(x-1,5)=0

Question

(x+8)(x-1,5)=0

Answer 1

 

Answer 2

-1,5х +8х -12 =0

+6,5х -12=0 /*10

10 +65х -120=0

D= 65*65 +4*120*10=4225+4800=9025=95*95

х=(-65+95)/4*10=30/40=3/4

х= (-65-95)/4*10=-160/40=-4

Ответ:3/4;   -4