find the value a if x+a is a factor of x³+3x²+4x+a.
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Answer:
Step-by-step explanation:
x + a = 0
⇒ x = -a
∴ (-a)³ + 3 × (-a)² + 4 × (-a) + a = 0
→ -a³ + 3a² -4a + a = 0
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