What is the value of a If 3x2+ax+a+3 divisible x+2?

What is the value of a If 3x2+ax+a+3 divisible x+2? Correct Answer 15

ধরি, f(x) = 3x² + ax + a + 3 f(x), x + 2 দ্বারা বিভাজ্য সেহেতু f( - 2) = 0 হবে ⇒ 3( - 2)² + a( - 2) + a + 3 = 0 ⇒12 - 2a + a + 3 = 0 ⇒ - a + 15 = 0 ⇒a = 15
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