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a= 1; b=-3; c=-6
akar2nya = x1 dan x2
x1 + x2 = -b/a
=> 3/1 = 3
x1 X x2 = c/a
=> -6/1 = -6
akar2 persamaan kuadrat baru = x1 + 4 dan x2 + 4
=>(x1 + 4) + (x2 + 4)
= x1 + x2 + 8
= 3 + 8 = 11
=>(x1+4) (x2+4)
= x1.x2 + 4 (x1 + x2) + 16
= -6 + 4(3) + 16
=-6 + 12 + 16 = 22
Persamaan kuadrat baru = x² - ((x1+4) + (x2+4))x + ((x1+4) (x2+4)) = 0
=> x² - 11x + 22 = 0
Semoga bermanfaat ^_^