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1.
-9x + 17 + 8x - 19
= -9x + 8x + 17 - 19
= -x - 2
Jawabannya : b.
2.
5(2a - 3b) - 6(3a - 4b)
= 10a - 15b - 18a + 24b
= 10a - 18a - 15b + 24b
= -8a + 9b
Jawabannya : b.
3.
2(x^2 - xy + x) - 3x(x + 4y -1)
= 2x^2 - 2xy + 2x - 3x^2 - 12xy + 3
= 2x^2 - 3x^2 - 2xy - 12xy + 2x + 3x
= x^2 - 14xy + 5x
Jawabannya : c.
4.
(t - 2) (2t - 3)
= 2t^2 - 3t - 4t + 6
= 2t^2 - 7t + 6
Jawabannya : c.
2.b
3.c
4.c
sry klo salah