What is the common factor in the expression: 5x^2+20x+30 A 2 B 3 C 5 D 10

To find the common factor in the expression , we need to identify the greatest common factor (GCF) of the coefficients.The coefficients in the expression are 5, 20, and 30. We need to find the largest number that divides all three coefficients evenly.The factors of 5 are: 1, 5The factors of 20 are: 1, 2, 4, 5, 10, 20The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30The common factors of 5, 20, and 30 are 1, 5, and 10. The greatest common factor is 5.Therefore, the common factor in the expression is 5.The correct answer is C.