m^2-n^2
hence find the value of 198^2-2^2
Please factorise this..?
2009-01-13 4:36 pm
回答 (4)
2009-01-13 4:40 pm
✔ 最佳答案
difference of squares.(m + n)(m - n)
(198 + 2)(198 - 2)
200(196)
39200<====answer
2009-01-14 12:44 am
( m - n )( m + n )
( 198 - 2 ) ( 198 + 2 )
( 196 ) ( 200 )
39,200
( 198 - 2 ) ( 198 + 2 )
( 196 ) ( 200 )
39,200
2009-01-14 1:10 am
m^2 - n^2 = (m + n)(m - n)
198^2 - 2^2
= (198 + 2)(198 - 2)
= (200)(196)
= 39200
198^2 - 2^2
= (198 + 2)(198 - 2)
= (200)(196)
= 39200
2009-01-14 12:49 am
This is D.O.T.S (Difference of two squares)
m^2 - n^2
(m + n)(m - n)
To prove it:
m^2 +nm - nm -n^2
m^2 - n^2
(m + n)(m - n)
(198 + 2)(198 - 2)
200(196)
39200
m^2 - n^2
(m + n)(m - n)
To prove it:
m^2 +nm - nm -n^2
m^2 - n^2
(m + n)(m - n)
(198 + 2)(198 - 2)
200(196)
39200
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