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Examples Solving Logarithmic Equations

Examples Solving Logarithmic Equations. Solve these log equations. Round off to the nearest hundredth. 2) 4 + 2 ln 5x = 20 -4. 1) -7 + 3 log 4 x = 8 +7. 2 ln 5x = 16 2 2. 3 log 4 x = 15

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Examples Solving Logarithmic Equations

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  1. Examples Solving Logarithmic Equations Solve these log equations. Round off to the nearest hundredth. 2) 4 + 2 ln 5x = 20 -4 1) -7 + 3 log 4 x = 8 +7 2 ln 5x = 16 2 2 3 log 4 x = 15 3 3 log 4 x = 5 ln 5x = 8 log e 5x = 8 45 = x e8 = 5x 1024.00 = x 2980.958 = 5x 5 5 596.19 = x

  2. Examples Solving Logarithmic Equations Solve these log equations. (Sometimes you have to condense first.) 3) log 3 x + log 3 (x + 8) = 2 log 3 x(x + 8) = 2 log 3 x2 + 8x = 2 32 = x2 + 8x 9 = x2 + 8x - 9 - 9 1 9 = 8 . 3 3 = 0 0 = x2 + 8x - 9 0 = (x - 1) (x + 9) x - 1 = 0 , x + 9 = 0 x = 1 , -9

  3. Examples Solving Log Equations – Factoring Use GCF to factor. 2) 25x9 - 10x6 + 15x3 1) 12x4 + 6x3 - 9x 3) -8x3y4 + 6x2y3 + 12xy 4) 14x3y2 - 10x2y3 + 6x4y

  4. Examples Solving Log Equations – Factoring Use Reverse FOIL to factor. 15) x2 + 10x + 21 16) x2 + 2x - 24 17) 6x2 - 7x - 3 18) 6x2 - 17x + 12

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