find the value of 'a' for which x+a is factor of polynomials is x^3+ax^2+a+4
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(x + a) is a factor of f(x). [x = -a]
When dividing, remainder is 0.
So, f(-a) = 0
(-a)³ + a(-a)² + a + 4 = 0
-a³ + a³ + a + 4 = 0
a + 4 = 0
a = -4 ✔
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