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bagian a
bagian b
Nomor 2
Nomor 3
= y^2 + 3y - 2x^2 - 13
= y ( y + 3 ) - 2x^2 -13
b. 5x^2 - xy + y^2 - 2x^2 - xy + 3y^2
= 3x^2 + 4 y^2 - 2xy
= x ( 3x -2y ) + 4 y^2
2. 7xy^2 + 11xy + 5x^2y - 7xy - 3xy^2
= 4xy^2 + 4xy + 5x^2y
= 4xy ( y + 1) + 5x^2y
3. b^2 - 3ab - 16 - ( b^2 + ab - 30)
= b^2 - 3ab - 16 - b^2 -ab + 30
= 14 - 4ab = 2 ( 7 - 2ab)