jika R (x+2) = x (x+4) maka R (x2-4)

Bab Fungsi
Matematika SMA Kelas X

R(x + 2) = x (x + 4)
R (x - 2 + 2) = (x - 2) (x - 2 + 4)
R (x) = (x - 2) (x + 2)
R (x) = x² - 4

R (x² - 4) = (x² - 4)² - 4
               = x⁴ - 8x² + 16 - 4
               = x⁴ - 8x² + 12