Cari nilai y
y=4-x^{2}
Cari nilai x (complex solution)
x=-\sqrt{4-y}
x=\sqrt{4-y}
Cari nilai x
x=\sqrt{4-y}
x=-\sqrt{4-y}\text{, }y\leq 4
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y=4-x^{2}
Kurangi x^{2} dari kedua sisi.
Contoh
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