Sean Connor
Administrator

These answers, emerging from her work and forum discussions, come courtesy of Lavinia…I’m just the messenger!
Below are answers for the Unit 4 Practice Test. Confirmation of accuracy would be appreciated!
1: (z + 2)(z – 2)
2: (w + 2)(w^2 – 2w + 4)
3: (5x – 6y)(25x^2 + 30xy + 36y^2)
4: (5z – 4)(z – 7)
5: 2x^5(5x^3 + 3x^2 + 11)
6: x = 5 or 1/6
7: (7t + 4)(7t – 4)
8: (x + 7)(7 – 4)
9: (x^2 + 3)(y + 10)
10: 2(4x + 5)(x – 3)
11: (3x – 5)(x – 2)
12: p = 3 or 5
13: 2(x + 7)(x 7)
14: (x + 7)(x – 1)
15: (3x + 2)(x – 5)
16: 2y(3x – 2)(x + 3)
17: (y – 6)^2
18: (y – 9)(x + 2)
19: (w^2 – 5)(w – 1)
20: (x + 6)(x + 9)
21: (x – 6)(x + 2)
22: 5(t + 11)^2
23: (z – 4)(z^2 + 4z + 16)
24: (x – 2)(x – 3)
25: (5x + 6)^2
26: m = 10 or 5
27: (3x + 2y)(9x^2 – 6xy + 4y^2)
28: x = 1 or 1/2
29: 2x^3y^2(2x^2y^3 + 5x + y^2)
30: (4x – 9)(3x + 2)

Emily McElroy
Student

I got different answers for numbers 25. and 29.
25: (5x6)^2 (taking the sign from the middle term)
29: 2x^3y^4 (2x^2y + 5xy^2 + 1)

Raúl Ramos
Student

Hi, I agree with Emily,
Besides, I think there’s a mistake in number 8, too.
The correct answer should be: (y4)(x+7)
I see Emily wrote her message back in December last year. Is anybody taking notes of our suggestions. I don’t mind sending my twopence, and I am thankful that these materials are available, but I’d like to do that it’s for something…
Regards

Ron Severtis
Student

Agree with Emily and Raul’s corrections. Also, the variable in #21 is a ‘y’ not an ‘x’.
