If -1 and 1 are two real roots of the polynomial function f(x) = ax 3 +
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If -1 and 1 are two real roots of the polynomial function f(x) = ax3 + bx2 + cx + d and (0,3) is the y-intercept of graph of f, what is the value of b ?
A) −3
B) −1
C) 2
D) 4
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