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9 January, 14:41

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

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  1. 9 January, 14:51
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    (s o t) (-7) = s (t (-7)) = s (3 (-7)) = s (-21) = 2 - (-21) ^2 = 2 - 441 = - 439
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