How do you multiply #(- 3a + 7) ( - 6a + 3)#?
1 Answer
Nov 22, 2016
Explanation:
We must ensure that each term in the second bracket is multiplied by each term in the first bracket.
This can be done as follows.
#(color(red)(-3a+7))(-6a+3)#
#=color(red)(-3a)(-6a+3)color(red)(+7)(-6a+3)# distribute the brackets.
#=18a^2-9a-42a+21# collect like terms.
#=18a^2-51a+21#