HP 35s HP 35s scientific calculator - User Guide - Page 313
Exponential and Logarithmic Functions, and the left parenthesis.
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If you were to key in the calculator would calculate the result, -107.6471. However, that's not what you want. To delay the division until you've subtracted 12 from 85, use parentheses: Keys: 4 Õ Display Description: No calculation is done. Calculates 85 − 12. Calculates 30/73. Calculates 30/(85 − 12) × 9. You can omit the multiplication sign (×) before a left parenthesis. Implied multiplication is not available in Equation mode. For example, the expression 2 × (5 - 4) can be entered as 4, without the key inserted between 2 and the left parenthesis. Exponential and Logarithmic Functions To Calculate: Natural logarithm (base e) Common logarithm (base 10) Natural exponential Common exponential (antilogarithm) Press: Display: ALG: Summary C-5