SBMPTN

Pertanyaan

Jika a³- a -1 = 0 maka a⁴ + a³ - a²- 2a-9=

1 Jawaban

  • a⁴ + a³ - a² - 2a - 9
    = a⁴ - a² - a - a + a³ - 9
    = a⁴ - a² - a + a³ - a - 1 - 8
    = a(a³ - a - 1) + (a³ - a - 1) - 8
    = a(0) + 0 - 8
    = -8

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