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29 March, 08:47

The radius of a cylinder is 3x - 2 cm. The height of the cylinder is x + 3 cm. What is the surface area of the cylinder? Use the formula A = 2πr^2 + 2πrh.

A. 2π (3x^2 + 10x - 8)

B. 2π (12x^2 + 7x - 2)

C. 2π (12x^2 - 2x + 13)

D. 2π (12x^2 - 5x - 2)

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Answers (1)
  1. 29 March, 09:12
    0
    Surface area = 2 pi (3x-2) ^2 + 2 pi (3x - 2) (x + 3)

    = 2 pi (9x^2 - 12x + 4 + 3x^2 + 7x - 6

    = 2pi (12x^2 - 5x - 2)

    Its D
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