(2)(1)(2) - (1)(2)(-1)
4 + 2 = 6
2x + 3x + 7 - 2 = 5x + 5
3x² + 2x² + 5x² - 7 - 2 + 7 = 10x² - 2 cm
2x - (-4x) + 3
2x + 4x + 3
= 6x + 3
(7x - 3y) - (7x + 3y)
7x - 3y - 7x - 3y --> (cancel 7x & 7x)
= -6y
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Answers & Comments
12. B
13. C
14. B
15. C
16. C
(2)(1)(2) - (1)(2)(-1)
4 + 2 = 6
17. A
2x + 3x + 7 - 2 = 5x + 5
18. A
3x² + 2x² + 5x² - 7 - 2 + 7 = 10x² - 2 cm
19. A
2x - (-4x) + 3
2x + 4x + 3
= 6x + 3
20. B
(7x - 3y) - (7x + 3y)
7x - 3y - 7x - 3y --> (cancel 7x & 7x)
= -6y