need help with this one :/
2^(3-x) = 2^x - 2
2^(3-x) - 2^x + 2 = 0 = 2^-x * 2 * 2 * 2 - 2^x + 2
someone who can help with the rest ?
Now, use the substitution
Fernando Revilla
It's worth noting that Fernando and Soroban's methods are essentially the same. Soroban just didn't formally make a substutution. Most students seem to understand the formal substitution better at first, and then switch to what Soroban did after they've done enough problems.