急問!唔該! 中三factorization一題

🎓 學業台小學及中學教育

樂衡

2007-06-11 10:24 pm

Factorize

r^2 + 10r + 25 - s^2

回答 (3)

Ricky

2007-06-11 10:30 pm

✔ 最佳答案

=r^2+2(r)(5)+5^2-s^2
=(r+5)^2-(s)^2
=(r+5+s)*(r+5-s)

參考: myself

👍 0 👎 0

用戶101192

2007-06-11 10:42 pm

= r^2 + 2*5*r + 5^2 -s^2
= (r+5)^2 - s^2
= (r+5+s) (r+5-s)

as (A+B)(A-B) = A^2 - B^2

👍 0 👎 0

用戶4872

2007-06-11 10:31 pm

r^2 + 10r + 25 - s^2
= r^2 + 2*5*r + 5^2 -s^2
= (r+5)^2 - s^2
= (r+5+s) (r+5-s)

as (A+B)(A-B) = A^2 - B^2

👍 0 👎 0