It's not 4.5^k it's actually written 4 × 5^k
So we know a^m + a^n = a^(m+n)
therefore, 5^k + 5^1 = 5^k+1
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It's not 4.5^k it's actually written 4 × 5^k
So we know a^m + a^n = a^(m+n)
therefore, 5^k + 5^1 = 5^k+1