( x2 − 9 )2  = A.   (x − 3) (x + 3)
B.   (x − 3)2 (x + 3)2
C.   x2 − 18x + 81
D.   x4 − 81
E.   x4 + 81
    A    B    C    D    E

[ 3-0838 - op net sinds 6.7.98-(E)-3.1.2025 ]

Translation in   E N G L I S H

See above

Oplossing - Solution

(x² − 9)² = [(x − 3)(x + 3)]² = (x − 3)².(x + 3)²
(x² − 9)² = (x²)² − 2.x².9 + 9² = x⁴ − 18x² + 81
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