F2 Math

2013-11-05 6:37 am

Solve the following exponential equations

圖片參考：http://imgcld.yimg.com/8/n/HA00008918/o/20131104223636.jpg

回答 (4)

2013-11-05 6:46 am

✔ 最佳答案

2^(x+2) + (3)(2^x) = 56

(2^2)(2^x) + (3)(2^x) = 56

4(2^x) + (3)(2^x) = 56

(7)(2^x) = 56

(2^x) = 8

x=3

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2013-11-06 12:45 am

2^(x).2^(2)+3.2^(x)=56
7.2^(x)=56
2^(x)=8
2^(x)=2^(3)
X=3

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2013-11-05 6:48 am

Here is the solution

2^x(2^2+3) = 56
2^x=56/7
2^x=8
2^x=2^3
x=3

參考: myself

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2013-11-05 6:46 am

2^x (2^2 + 3) = 56
2^x (7) = 56
2^x = 8
x = 3

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