Ask questions and get helpful responses.

math

sovle: (3x - 2y)^2

The answer is 9x^2 + 4y^2 - 12xy but I do not know how to get the 12xy part.

20 - 4/5x is greater that or equal to 16, then:

The answer is x is less thatn or equal to 5 but again I do not know how to get this.

  1. 👍
  2. 👎
  3. 👁
  4. ℹ️
  5. 🚩
  1. (3x - 2y)^2 = (3x-2y)(3x-2y)
    You could use FOIL
    (3x)(3x)+(3x)(-2y)+(-2y)(3x)+(-2y)(-2y)
    = 9x^2 -12xy +4y^2
    or use the distributive property of multipication directly
    3x(3x-2y) - 2y(3x-2y)
    =9 x^2 -6xy -6xy + 4y^2
    = 9x^2 - 12 xy + 4y^2

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩
  2. 20 - 4/5x >/= 16
    If that is what you mean then

    100 x - 4 >/= 80 x
    20 x - 4 >/= 0
    20 x >/= 4
    x >/= 1/5
    or if you mean
    20 - (4/5)x >/= 16
    20 - 16 >/= (4/5) x
    4 >/= (4/5) x
    5 >/= x

    1. 👍
    2. 👎
    3. ℹ️
    4. 🚩

Respond to this Question

First Name

Your Response

Still need help? You can ask a new question.