Question

решите уравнение 2(5х-7)(1+х)=0

Answer 1

5х-7=0 или 1+х=0

х=7/5 или х=-1  

Answer 2

2(5x+5x2-7-x)=0

10x2-4x-14=0

5x2-2x-7=0

D=144, 12

x1=(2+12)/10=1.4

x2=(2-12)/10=-1