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7 April, 13:52

If s (x) = 2 - x2 and t (x) = 3x, which value is equivalent to (s t) (-7) ?

a. - 439

b. - 141

c. 153

d. 443

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Answers (1)
  1. 7 April, 14:20
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    S (x) = 2 - x^2

    t (x) = 3x

    (s o t) (x) = s (t (x)) = 2 - (3x) ^2 = 2 - 9x^2

    (s o t) (-7) = 2 - 9 (-7) ^2 = 2 - 9 (49) = 2 - 441 = - 439
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