EDGE Math 8

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Click on your answer to each question.

1.	What is ${(13 x - 1)}^{2}$ equal to?

169 x^{2} - 1

169 x^{2} + 1

169 x^{2} - 26 x + 1

169 x^{2} + 26 x + 1

Answer: $169 x^{2} - 26 x + 1$

2.	Which of the following expressions is ${(4 a - 1)}^{3}$ equal to?

6 a^{3} - 1

6 a^{3} + 1

6 a^{3} - 48 a^{2} + 12 a - 1

6 a^{3} + 48 a^{2} - 12 a - 1

Answer: $6 a^{3} - 48 a^{2} + 12 a - 1$

3.	Which of the following expressions is equal to $(4 y + 1) (16 y^{2} - 4 y + 1) ?$

64 y^{3} + 1

64 y^{3} - 1

64 y^{3} - 4 y^{2} + 1

64 y^{3} + 4 y^{2} + 1

Answer: $64 y^{3} + 1$

4.	What should be the value of k so that $9 x^{2} + 42 x + k$ is a perfect square trinomial?

25

49

63

64

Answer: 49

5.	Which of the following numbers can be a value of k so that $16 x^{2} + k x + 25$ is a perfect square trinomial?

18

20

36

40

Answer: 40

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