Question

Factor completely, then place the answer in the proper location on the grid.21a 2 - 57a 30

Answer 1

21 a² - 57 a + 30 =
= 3 ( 7 a² - 19 a + 10 ) =  
= 3 · 7 · ( a - 5/7 ) · ( a - 2 ) = 
= 3 ( 7 a - 5 ) ( a - 2 )