已知x满足2的2x+3次方-2的2x+1次方=48,求x 由题意 [2^(2x+1)]*(2^2-1)=48 [2^(2x+1)]*3=48 [2^(2x+1)

问题描述:

已知x满足2的2x+3次方-2的2x+1次方=48,求x 由题意 [2^(2x+1)]*(2^2-1)=48 [2^(2x+1)]*3=48 [2^(2x+1)
不懂 怎么会变成[2^(2x+1)]*(2^2-1)?

已知x满足2的2x+3次方-2的2x+1次方=48,求x
由题意 [2^(2x+1)]*(2^2-1)=48 [2^(2x+1)]*3=48 [2^(2x+1)
2的2x+3次方=[2^(2x+1)]*(2^2-1)即(2x+3)分解因式得2x+1)(2^2-1);