2013澳大利亚高考数学试题答案(3)

3 The Argand diagram below shows the complex number z.

Which diagram best represents z2?

(A) (B)

(C) (D)

4

The polynomial equation 4x3 + x2 3x + 5 = 0 has roots α, β and γ . Which polynomial equation has roots α+ 1, β+ 1 and γ+ 1? (A) 4x3 11x2 + 7x + 5 = 0 (B) 4x3 + x2 3x + 6 = 0 (C) 4x3 + 13x2 + 11x + 7 = 0 (D) 4x3 2x2 2x + 8 = 0