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Evaluate the expression for u=−1u = -1.\newline13−7u=13 - 7u = _____

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Full solution

Q. Evaluate the expression for u=−1u = -1.\newline13−7u=13 - 7u = _____
  1. Substitute u=−1u = -1: Substitute u=−1u = -1 into the expression 13−7u13 − 7u.\newlineSubstitute −1-1 for uu in 13−7u13 − 7u to get 13−7(−1)13 − 7(-1).
  2. Evaluate expression: Evaluate 13−7(−1)13 − 7(-1).\newline13−7(−1)13 − 7(-1) equals 13+713 + 7 (since multiplying by −1-1 changes the sign).
  3. Add 1313 and 77: Add 1313 and 77 together.\newline13+713 + 7 equals 2020.

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