-3a - b + 7 + 13a - (-2b) + 4
= -3a - b + 7 + 13a + 2b + 4
= (-3 + 13)a + (-1 + 2)b + 7 + 4
= 10a + b + 11
..
(2x – 5)(3x + 1)
= (2x)(3x) + (2x)(1) - (5)(3x) - (5)(1)
= 6x² + 2x - 15x - 5
= 6x² - 13x - 5
(-3a - b + 7) + (13a - (-2b) + 4)
(2x - 5)(3x + 1)
= 2x(3x + 1) - 5(3x + 1)
= 6x² - 13x - 4
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Nomor 1
-3a - b + 7 + 13a - (-2b) + 4
= -3a - b + 7 + 13a + 2b + 4
= (-3 + 13)a + (-1 + 2)b + 7 + 4
= 10a + b + 11
..
Nomor 2
(2x – 5)(3x + 1)
= (2x)(3x) + (2x)(1) - (5)(3x) - (5)(1)
= 6x² + 2x - 15x - 5
= 6x² - 13x - 5
(-3a - b + 7) + (13a - (-2b) + 4)
= -3a - b + 7 + 13a + 2b + 4
= 10a + b + 11
(2x - 5)(3x + 1)
= 2x(3x + 1) - 5(3x + 1)
= 6x² + 2x - 15x - 5
= 6x² - 13x - 4