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15 March, 11:44

The variables X, Y, and Z represent polynomials where X = a, Y = 3a - 5, and Z = a2 + 2. What is X2Y - Z in simplest form?

A. 2a2 - 5a - 2

B. 3a3 - 6a2 - 2

C. - 3a3 - 2

D. - 3a2 - 2

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Answers (1)
  1. 15 March, 14:47
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    X = a; y = 3a - 5; z = a² + 2

    x²y - z

    substitute each letter by its value.

    a² (3a-5) - (a² + 2)

    3a³ - 5a² - a² - 2

    3a³ - 6a² - 2 Choice B.
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