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19 December, 16:49

Which of these is a correct expansion of (3x - 2) (2x2 + 5) ?

A. 3x • 2x2 + 3x • 5 + (-2) • 2x2 + (-2) • 5

B. 3x • 2x2 + 3x • 5 + 2 • 2x2 + 2 • 5

C. 3x • 2x2 + (-2) • 2x2 + 2x2 • 5 + (-2) • 5

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Answers (2)
  1. 19 December, 19:38
    0
    The correct answer is B.
  2. 19 December, 20:30
    0
    (3x - 2) (2 x^2 + 5)

    = (3x + - 2) (2 x^2 + 5)

    = (3x) (2 x^2) + (3x) (5) + (-2) (2 x^2) + (-2) (5)

    = 6 x^3 + 15x - 4 x^2 - 10

    = 6 x^3 - 4 x^2 + 15x - 10

    The correct answer is, 6 x^ 3 - 4 x^2 + 15x - 10
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Home » Mathematics » Which of these is a correct expansion of (3x - 2) (2x2 + 5) ? A. 3x • 2x2 + 3x • 5 + (-2) • 2x2 + (-2) • 5 B. 3x • 2x2 + 3x • 5 + 2 • 2x2 + 2 • 5 C. 3x • 2x2 + (-2) • 2x2 + 2x2 • 5 + (-2) • 5
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