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9 November, 16:10

Evaluate and Explain

3t (t+2) - 3t^2 for t=19

and

Simplifiy

- (3a-2b) - 3 (-a-b)

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Answers (1)
  1. 9 November, 19:31
    0
    1) 3 t (t + 2) - 3 t² =

    = 3 t² + 6 t - 3 t² = 6 t = 6 · 19 = 114

    2) - (3 a - 2 b) - 3 ( - a - b) =

    = - 3 a + 2 b + 3 a + 3 b = 5 b
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