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a=2
b=-1
c=-28
x1x2= -b±√b²-4ac /a <------ rumus abc
= -(-1)±√-1²-4.2.-28 /2 <--- /2 = per 2
= 1±√1+224 /2
= 1±√225 /2
= 1±15 /2
x1= 1-15 /2
= -14/2
=-3,5
=-4
x2= 1+15 /2
=16/2
=4
2x1+x2
=2.-4+4
=-8+4
=-4
maaf kalo salah ya
di sana saya pakai rumus abc...