factorize the expressions.
9r^2-(3r-4s)^2.
點計,help me
math f.3
2009-10-31 8:33 pm
回答 (1)
2009-10-31 8:42 pm
✔ 最佳答案
9r^2 - (3r - 4s)^2
= (3r)^2 - (3r - 4s)^2
= (3r + 3r - 4s)(3r - 3r + 4s)
= (6r - 4s)(4s)
= 8s(3r - 2s)
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