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ab^2 = 4
( C ) 2 dan 4
2. 7x - 4y + 6 - 4x - 6
= 7x - 4x - 4y + 6 - 6
= 3x - 4y ( C )
3. 5ab + 2bc - d + 3ab - 2bc + 6d
= 5ab + 3ab + 2bc - 2bc - d + 6d
= 8ab + 5d ( A )
4. -2 ( 3p + 2) -2p + 6
= - 6p - 4 - 2p + 6
= -6p - 2p - 4 + 6
= - 8p + 2 ( A )
5. ( 2x + 3y ) ( x - 4y )
= 2x^2 - 8xy + 3xy - 12 y^2
= 2x^2 - 5xy -12y^2 ( D )
6. 15a^3b : 5 a^2
= 3ab ( A )
7. ( 2a + b )^2
= ( 2a + b ) ( 2a + b )
= 4a^2 + 2ab + 2ab + b^2
= 4a^2 + 4ab + b^2 ( C )