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watchmath
 5 years ago
Stolen problem from Dinda :D
Without calculator, find 8^(x)+8^x
if you are given that 4^x+4^(x)=7
watchmath
 5 years ago
Stolen problem from Dinda :D Without calculator, find 8^(x)+8^x if you are given that 4^x+4^(x)=7

This Question is Closed

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.02^(2x)+2^(2x)=7 (2^x+2^x)^2=9 2^x+2^x=3; let a=2^x a+1/a=3 (a+1/a)^3=27 a^3+1/a^3+3(a+1/a)=27 a^3+1/a^3=18 but a^3=8^x. so ans is 18

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0if u have any more prob. u can post it....i'll try

watchmath
 5 years ago
Best ResponseYou've already chosen the best response.0Ok, I'll repost my old problem that has no answer

anonymous
 5 years ago
Best ResponseYou've already chosen the best response.0i have answered your next problem...
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