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December 9, 2016

Homework Help: Maths! Check Answers

Posted by Jman on Wednesday, May 15, 2013 at 3:30pm.

For questions 17–21, simplify the expression.
17. 7t4 • 7t4

49t8
14t4
49t16
14t8

18. –3(4x + 5)

7x + 15
7x – 15
–12x – 15
–12x + 15

19. 5k2(–6k2 – 2k + 6)

–30k3 + 3k2 + 30k
30k4 – 10k3 + 11k2
–k4 + 3k3 + 11k2
–30k4 – 10k3 + 30k2

20. (–8x) • 3x2

–5x3
–24x2
–24x3
–5x2
21. (7y2 – 3y) + (8y2 – 8y)

56y2 – 24y
15y2 – 11y
–y2 + 5y
y2 – 5y

MY ANSWERS
17. A
18. C
19. D
20. ?
21. B

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