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2x + 3y(4x - 5y) + 7x - 1
2x + 12xy + - 15y^2 + 7x - 1
2x + 7x + 12xy + - 15y^2 - 1
9x + 12 xy - 15y^2 - 1
Note: ^ = pangkat
B.
3x - (4x + 1) + 5y - 4y + y
3x - 4x - 1 + 5y - 4y + y
3x - 4x + 5y - 4y + y - 1
-x + 2y - 1
C.
4 - 2x + 5x - 1 + 7x
-2x + 5x + 7x + 4 - 1
10x + 3
D.
2a(a + 1) - a^2 + 4
2a^2 + 2a - a^2 + 2a + 4
2a^2 - a^2 + 2a + 4
a^2 + 2a + 4
Note: ^ = pangkat