Question

-2x²-30x-100=0

Answer 1

解:-2x^2-30x-100=0
x^2+15x+50=0
(x+10)(x+5)=0
x=-10或x=-5

Answer 2

-2x²-30x-100=0;
→2x²+30x+100=0;
→x²+15x+50=0;
→(x+10)(x+5)=0;
x1 = -10 x2 = -5;