tolong,besok ditumpuk

1. Jawab :
A. ( x + 2 )( x + 3 ) = ( x^2 + 3x + 2x + 5 ) = x^2 + 5x + 5
B. ( x + 3 )( x - 3 ) = ( x^2 - 3x + 3x - 9 ) = x^2 - 9
C. ( x - 2 )( x - 3 ) = ( x^2 - 3x - 2x + 6 ) = x^2 - 5x + 6
D. ( 2x - 1 )( x + 2 ) = ( 2x^2 + 4x - x - 2 ) = 2x^2 + 4x - 2

2. Jawab :
A. ( x + 2 )^ = ( x + 2 )( x + 2 ) = ( x^2 + 2x + 2x + 4 ) = x^2 + 4x + 4
B. ( x - 2 )^ = ( x - 2 )( x - 2 ) = ( x^2 - 2x - 2x + 4 ) = x^2 - 4x + 4
C. ( a + b )^ = ( a + b )( a + b ) = ( a^2 + ab + ab + b^2 ) = a^2 + a^2b^2 + b^2
D. ( a - b )^ = ( a - b )( a - b ) = ( a^2 - ab - ab + b^2 ) = a^2 - a^2b^2 + b^2

3. Jawab :
A. ( x + 1 )( x - 1 ) = ( x^2 - 1x + 1x - 1 ) = x^2 - 1
B. ( 2x - 3 )( 2x + 3 ) = ( 4x^2 + 6x - 6x - 9 ) = x^2 - 9

Kalau gak salah begitu. Terimakasih ^_^