1. Multiply and Simplfy:
(3x +5) (x -3)
2. Simplify 400y^2
a. 200y
b. 100y
c. 20y
d. 2y square root 100
3. (x+3)(x+3) = x2 + 9
is that true or false?
4.Simplify 125x^5y^2
a. 25x^5^2
b.5x^2y square root 5x
c. 10xy square root 25x^3
d. 5xy square root 5x^3y
2007-02-09 15:55:54 · 9 answers · asked by Anonymous in Science & Mathematics ➔ Mathematics
1)3x^2-4x-15
2)i suppose u mean sqrt(400y^2)
then c=d
3)false
4)something not right
if sqrt(125x^5y^2) then: b
2007-02-09 16:04:21 · answer #1 · answered by Maths Rocks 4 · 0⤊ 0⤋
1. You can "FOIL" it out. FOIL stands for Firsts, Outsides, Insides, Lasts, the order which you multiply it out. Multiplying it out gives you:
3x^2-9x+5x-15
3x^2-4x-15
2. 400y^2 is the simplest form of 400y^2. If you're talking about the square root of 400y^2, then the answer would be c. 20y, since (20y)^2 is the same as 20^2 y^2, which is 400y^2, thus showing that it is the square root.
3. False, by "FOIL"-ing it out, you get x^2+6x=81. You can also remember that (x+y)(x+y)=x^2+2xy+y^2
4. I'm thinking you left out the square root. In that case it would be b., 5x^2y square root 5x
2007-02-09 16:06:18 · answer #2 · answered by CB #7 ftw 3 · 0⤊ 0⤋
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2016-11-03 01:14:06 · answer #3 · answered by quinteros 4 · 0⤊ 0⤋
1)3x^2-4x-15
2) none of the answers make sense to me ( is that 400 times y squared?)
3)False
4) doesn't make sense either
2007-02-09 16:06:33 · answer #4 · answered by htaylor1021 3 · 0⤊ 0⤋
1. 3x^2 - 4x - 15.
2. c.
3. False.
4.
2007-02-09 16:03:16 · answer #5 · answered by Anonymous · 0⤊ 0⤋
1.) 3x^2 + 2x -15
2.) 20y
3.) false
4.) I'm not in the mood for doing something I can't do in my head.
2007-02-09 16:01:43 · answer #6 · answered by Myglassesarealwaysclean 5 · 0⤊ 0⤋
Ah pre algebra I feel your pain but i know how to do it!
1. (3x+5) (x-3)
2007-02-09 16:02:52 · answer #7 · answered by Anonymous · 0⤊ 0⤋
1. 3X^2-4X-15
2. 20y
3. false
4. sooo sorry but i cant help you with that one....my head hurts already lol
2007-02-09 16:09:58 · answer #8 · answered by Anonymous · 0⤊ 0⤋
do your own math i do
2007-02-09 16:03:29 · answer #9 · answered by Anonymous · 0⤊ 1⤋