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Posted by: Mr. Babatunde« on: February 14, 2020, 01:59:26 AM »2.0 NUMERICAL PROCESSES (2) THEORY OF LOGARITHMS & INDICES OBJECTIVES 1. Express statements given in index form (such as 81 = 3^4) as an equivalent logrithms statement (log 3 81 = 4). 2. Evaluate expression given in logarithms form. 3. Note the equivalence between the laws of indices and the law of logarithms 4. Recall and use the law of logarithms to simplify and/or evaluate given expression without the use of logarithm table. 5. Use logarithms table for the purpose of calculation. 2.1 LAW OF LOGARITHMS & INDICES The three fundamental law of indices can be stated in their equivalent logarithms form; 1. In indices: Y^a x Y^b = Y^a+b (Note ^ means Raise to power) * In Logarithms: Log(MN) = Log M + Log N 2. In indices: Y^a ÷ Y^b = Y^ab (Note ^ means Raise to power) * In Logarithms: Log(M/N) = Log M  Log N 3. In indices: (X^a)^b = X^ab (Note ^ means Raise to power) * In Logarithms: Log(M^p) = p log M Example 1: Simplify Log 8 + Log 5 solution; Log 8 + Log 5 = Log(8x5) Ans = Log 40 Example 2: Simplify Log 9 ÷ Log 3 solution; Log 9 ÷ Log 3 = Log 9/Log 3 = Log 3^2 / Log 3^1 (Note / means All over) = 2 Log 3 / 1 Log 3 (Log 3 will cancel Log 3) = Log 2/1 Ans = Log 2 Example 3: Given that Log 2 = 0.30103; Calculate Log 5 without using table solution; Log 5 = Log 10/2 = Log 10  Log 2 (Note: Log 10 = 1) = 1  0.30103 Ans = 0.69897 Example 4: Evaluate Log base3(6.84) to 2 d.p solution; Log3 (6.84) = Let Log3 (6.84) = x then 3^x = 6.84 = log(3^x) = log(6.84) x = log(6.84) / log(3) x = 0.8351 / 0.4771 Ans = 1.75 2.2 CALCULATIONS USING LOGARITHM TABLE Example 1: Evaluate 82.47 x 24.85 / 209.3 solution; Draw a table form with "No & Log" No 82.47 = log 1.9163 (No means Number) No 24.85 = log 1.3954 Add together = 3.3117 No 209.3 = log 2.2307 (from log table) Deduct 2.2307 from 3.3117 = 3.3117  2.2307 Ans = 0.9910 2.3 LAW OF INDICES The following laws of indices are true for all nonzero value a, b and x 1. X^a x X^b = X^a+b (Note ^ means Raise to power) 2. X^a ÷ X^b = X^ab (Note ^ means Raise to power) 3. X^0 = 1 4. X^1 = 1 / X^a (Note / means All over) 5. (X^a)^b = X^ab 6. X^1/a = a√x (Note √ means Square root) 7. X^a/b = b√x^a or (b√x)^a 2.3.1 WORKED EXAMPLES Example 1: Simplify 25^1/2 solution; 25^1/2 = √25 Ans = 5 Example 2: 4^3 ÷ 4^5 solution; 4^3 ÷ 4^5 = 4^35 = 4^2 = 1 / 4^2 Ans = 1/16 REVISION EXERCISE [1] Simplify 3^8 x 3^3 [2] Simplify 5^3 x 5^1 [3] Express Log 3 + Log 4 [4] Evaluate 3Log2 + Log20  Log1.6 [5] Simplify Log 8  Log 4 [6] Simplify Log 8 ÷ Log 4 [7] Simplify Log 4 / Log 2 [8] Simplify (27/48)^3/2 [9] Simplify 3^6 ÷ 3^2 [10] Simplify (4/25)^1/2 x (2^4) ÷ (15/2)^2 Visit www.spyloadedng.com/cbt/ to do Quiz
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