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May 23, 2015

Homework Help: algebra

Posted by erin on Wednesday, August 1, 2007 at 12:15pm.

1)Simplify:(3x^0y^-4)(2x^2y)^3
answer=6x^6 over y

2)Simplify:2x^2y^5z^-4 over 8x^6yz^3
answer= y^4 over 4x^4z

3)Saturn is 1.4 x 10^9 kilometers away from the sun. If light travels 3.0 x 10^4 km per second,how long does it take light from the sun to reach saturn? Express the answer in scientific notation.
answer= 4.7 x 10^4 sec.

4)Simplify:(7x^3 - 2x^2 +3)+(x^2-x-5)
answer= 7x^3 -3x^2 -2

5)Simplify:(5x-4)^2
answer= 25x^2 - 16

1) No. You did not cube the 2 in the second paren.
2) No. Redo the z
4) recheck the x^2 and the x terms.
5) No. Think FOIL. What is the middle term.

1) No. You did not cube the 2 in the second paren.
2) No. Redo the z
4) recheck the x^2 and the x terms.
5) No. Think FOIL. What is the middle term.

1)216x^6 over y
2)y^4 over 4x^4z^7
4)7x^3-2x^2-x-2
5)I dont get it but is it 25x^2-20x+16

1. I don't kinow how you got 216. 2^3 is 8 and that times 3 is 24. (I think you cubed 2 and cubed 3, then multiplied them together to get 216 BUT the problem doesn't say to cube 3. The only number cubed is 2.
2. ok.
I didn't do the others.

so it's 24x^6 over y

That's what I get. Check it out.

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