Algebra 1

1) what is the simplified form of (x-2)(2x+3)? Use the distributive property.
A) 2x^2-x-6
B) 2x^2-6
C)2x^2-7x-6
D) 2x^2 +x-6****

2) what is the simplified form of (3x+2)(4x-3) use a table.
A)12x^2+18x+6
B) 12x^2+x-6
C) 12x^2+18x-6****
D)12x^2-x-6

3) what is the simplified form of (4p-2)(p-4)
A)4p^2+6p-16
B)4p^2-18p+8
C)4p^2-14p-6
D)4p^2-6p+16****

4) the radius of a cylinder is 3x-2 cm. the height of a cylinder is x+3 cm. what is the surface area of the cylinder? Use the formula A=2pi r^2+2pi rh
A) 2pi(3x^2+10x-8)
B) 2pi(12x^2+7x-2)
C) 2pi(12x^2-2x+13)
D) 2pi(12x^2-5x-2)
Pi=the pi symbol I didn't know how to do that

5) what is the simplified form of (2x^2+4x-3)(3x+1)
A) 6x^3+10x^2-5x+5
B) 6x^3+14x+5x-3
C) 6x^3+14x^2-5x-3
D) 6x^3-10x^2-5x-3

asked by Tris
  1. @mssue

    posted by Tris
  2. #1, your middle term is -x , thus A

    #2 D

    #3 B
    How are you doing these, so far they are all wrong
    (4p-2)(p-4)
    = 4p^2 - 16p - 2p + 8
    = 4p^2 - 18p + 8

    #4
    A = 2πr^2 + 2πrh
    = 2π(3x-2)^2 + 2π(3x-2)(x+3)
    = 2π[ 9x^2 - 6x - 6x + 4 + 3x^2 + 9x - 2x - 6]
    = 2π[12x^2 - 5x - 2] ,
    which is D

    #5
    (2x^2+4x-3)(3x+1)
    = 6x^3 + 2x^2 + 12x^2 + 4x - 9x - 3
    = 6x^3 + 14x^2 - 5x - 3

    I think you will need more practise with these.

    posted by Reiny
  3. Thank you so much, and I know I have been practicing then I jut for some reason don't undertsand

    posted by Tris
  4. A
    D
    B
    D
    C

    posted by Meh
  5. @Meh is correct

    posted by the pretty princess
  6. 4.2(2-2x)=-3x
    a.-4
    b.4
    c.6**
    d.0

    is that right??

    posted by seb
  7. meh is 100% correct thanks

    posted by Ur butt
  8. MehIsCorrect

    posted by MehIsCorrect
  9. A
    D
    B
    D
    C
    D

    posted by me
  10. me is all right

    posted by anon
  11. me, is correct.

    posted by personification personified

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