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Joshua
20 September, 23:32
Factor this expression completely 9a4 - b2
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Roland
21 September, 02:04
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First write out all of the factors you have for each term (I am also making the assumption that the expression is 9a^4 - b^2, where ^ is signifying an exponent)
(3*3*a*a*a*a) - (b*b*1)
Seeing as how there is nothing to factor out of either term, your answer is:
(3a^2 + b) (3a^2 - b) you can check that this is correct by distributing this:
(3a^2) (3a^2 - b) and (b) (3a^2 - b). Let me know if this doesn't make sense!
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