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f(x) = x² + 4
29 = x² + 4
- x² = 4 - 29
- x² = - 25
x² = 25
x = √25
x = 5
Pembuktian
f(x) = x² + 4
f(5) = 5² + 4
= 25 + 4
= 29 (Terbukti)
Jadi 29 adalah bayangan dari 5