Factor as :
(x+9)(x+10)
using the first terms ( x terms) multiply to x2; the last terms multiply to 90; the sum of 9x + 10 x = 19x
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7 is not a factor of 90. It does not divide into 90 evenly.
Since 18 is a factor of 90 and it is the largest factor of itself, the greatest common factor of 18 and 90 is 18.Since 18 is a factor of 90, it is automatically the GCF.
The greatest common factor of 54 and 90 is 18.
The greatest common factor of 90 and 130 is 10.
The Greatest Common Factor (GCF) of 5 and 90 is 5