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difaktorkan maka
(x-5)(x+8)
maka x1=5 dan x2=-8
lalu akar2nya dikali 2
x1=5.2=10
x2=-8.2=-16
RUMUS PERSAMAAN KUADRAT
f(x)=a(x-x1)(x-x2)
f(x)=1(x-10)(x+16)
f(x)=x^2+16x-10x-160
f(x)=x^2+6x-160
a=1 karena dalam rumus di atas a=1 yg diganti hanya x