I asked this question earlier: find x for log₂(4.3ˣ-6)-log₂(9ˣ-6)=1
I understand the first part, but do not understand the substitution.
Can someone please thoroughly explain the steps after let u=3ˣ ?
Please and thank you
Because 9^x = (3^2)^x, when we substitute 3^x as u , 9^x will become u^2
9x = (32)x = 32x
= (3x)2 = u2
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