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3-42.

Rewrite each expression in the form $A\left(b\right)^{x}$ .

$6 \cdot 2 ^ { ( 4 x + 3 ) }$
Step 1(a):
$(6)2^{4x}2^{3}$
Step 2(a):
$(6)2^{4x}(8)$
Step 3(a):
$\left(48\right)\left(2^{4}\right)^{x}$
Step 4(a):
$\left(48\right)\left(16\right)^{x}$

$18 \cdot 3 ^ { ( 3 x - 4 ) }$
Hint (b):
Use the same thinking process as shown in part (a).

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