You need at least two things to find something in common between them.
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The letter 'c' in 'gcf' stands for "common", meaning "same for both". There's nothing
'common' about a single item, and "18x to the 3rd power" is a single number.
The GCF is 6x^3.
gcf(12x, 18x²) = 6x
GCF of 18c tothe third power and 24c to the third power is 6 c tothe third power.
The GCF is 6.
The GCF is 2^3 x 3^2 x 5