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First, look at the problem 9a^2 - 24ab + ____.

Factor it out while keeping in mind the missing constant.

(3a-____)(3a-____)

Then, think about a number that when inserted into the blanks, will make the statement (3a)(?) + (3a)(?) = 24ab.

Let try 4b.

(3a -

Use the

=9a^2 - 12ab -12ab