maths

2007-08-02 3:29 am
請幫幫我吧

1) (-2x-3)^2?

2) (x-3)^2?

3) (4x+5)^2?

謝謝

回答 (1)

2007-08-02 3:34 am
✔ 最佳答案
根據公式: ( a + b )^2 = a^2 + 2ab + b^2,

( 1 ) ( - 2x - 3 )^2

= ( 2x + 3 )^2

= 4x^2 + 12x + 9

( 2 ) ( x - 3 )^2

= x^2 - 6x + 9

( 3 ) ( 4x + 5 )^2

= 16x^2 + 40x + 25
參考: My Maths Knowledge


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