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Evaluate the expression for r = 2.

11r^2 − 5 =

1 answer

To evaluate the expression \(11r^2 - 5\) for \(r = 2\), follow these steps:

  1. Substitute \(r = 2\) into the expression: \[ 11(2)^2 - 5 \]

  2. Calculate \(2^2\): \[ 2^2 = 4 \]

  3. Substitute this back into the expression: \[ 11(4) - 5 \]

  4. Multiply \(11\) by \(4\): \[ 44 - 5 \]

  5. Finally, subtract \(5\) from \(44\): \[ 44 - 5 = 39 \]

Thus, the value of the expression for \(r = 2\) is \(\boxed{39}\).