What's the complete factorization of 10a^2 - 40a + 30?
a) 10(a - 4)(a - 1)
b) 10(a - 1)(a - 3)
c) 10(a + 1)(a + 3)
d) 10(a - 1)(a + 3)

Ok first you want to reduce down to get the poly into its smallest form. You can do this by dividing by 10 which leaves you with a^2-4a+3. Now you use regular factoring rules. For this equation you need what multiplies to get +3 and adds to get -4. Which is a -1 and a -3. Now you put it into the blanks to get        10(a-1)(a-3)

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