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jadi,
x^2 + x + 1 - 13 = 0
X^2 + x - 12 =0
(x+4)(x-3)=0
x= -4
x=3
tapi kenapa ga ada jawabannya ya.
21. |x-4| ≤ 1
-1 ≤ x-4 ≤ 1
-1+4≤ x ≤ 1+4
3 ≤ x ≤ 5