Homework Help: Math: Check answers

Posted by Deborah on Tuesday, January 29, 2013 at 11:03am.

1. How can this product be simplified?
5x2(2x – 3)

5x2 + 2x – 3

10x3 – 15x2

–5x2

7x3 – 15x2

2. What is the GCF of the terms of 8c3 + 12c2 + 10c ?

2

4

2c

4c

3. How can the polynomial 6d4 + 9d3 – 12d2 be factored?

3d2(2d2 + 3d – 4)

3d2(3d2 + 6d – 9)

3d(d3 + 3d2 – 4)

6d2(d2 + 3d3 – 6)

4. There is a circular garden in the middle of a square yard. The radius of the circle is 4x. The side length of the yard is 20x. What is the area of the part of the yard that is not covered by the circle?

4x(5)

8x2(5 – )

16x(25 + )

16x2(25 – )

5. What is the simplified form of –3z2(z + 2) – 4(z2 + 1)?

–7x2 + 1

–3z3 – 4z2 – 6z – 4

–3z3 – 2z2 – 4

–3z3 – 10z2 – 4

Answers:

1.)B
2.)C
3.)A
4.)D
5.)D

Thank You

Math: Check answers - Steve, Tuesday, January 29, 2013 at 11:26am
Your answers are all correct, but online one usually uses ^ for powers, so #1 would be written as

5x^2 (2x-3)

also, copy/paste does not do well with special characters, so that's why your exponents came out as they did, and why π didn't show at all.

I had to scratch my head some on #4!
Math: Check answers - Deborah, Tuesday, January 29, 2013 at 11:37am
Thank You very much. And Thank You for showing me how to do the exponents.
Math: Check answers - Steve, Tuesday, January 29, 2013 at 11:39am
aww, shucks. How could I refuse? My first girlfriend's name was Deborah!

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