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Evaluate the expression for r=−1r = -1.\newline−4r+8=-4r + 8 = _____

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Full solution

Q. Evaluate the expression for r=−1r = -1.\newline−4r+8=-4r + 8 = _____
  1. Write Expression with Given Value: Write the expression −4r+8-4r + 8 with the given value of rr, which is −1-1.\newlineSubstitute −1-1 for rr in the expression −4r+8-4r + 8.\newline−4(−1)+8-4(-1) + 8
  2. Substitute Value in Expression: Evaluate the expression –4(–1)+8–4(–1) + 8.\newlineMultiplying –4–4 by –1–1 gives us 44, because the product of two negative numbers is positive.\newline4+84 + 8
  3. Evaluate Expression: Add 44 and 88 to get the final result.\newline4+8=124 + 8 = 12

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