Since 49 is a factor of 343, it is automatically the GCF.
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Since 49 is a factor of 98, it is automatically the GCF.
(xy - 7)(x^2y^2 + 7xy + 49)
(4x + 7)(16x2 - 28x + 49)
A factor is a number that divides into another number. Factors of 19 are 1 and 19. Factors of 49 are 1, 7, and 49. Therefore, 1 is the greatest common factor.
49. 343/7=49