tabyers5891 tabyers5891
  • 22-04-2020
  • Mathematics
contestada

which of the equations are true identities? a. (3x-2y)(2y-3x)=9x^2-4y^2 b. (2k+5r)(2k-5r)=4k^2-25r^2

Respuesta :

lublana
lublana lublana
  • 23-04-2020

Answer:

b.[tex](2k+5r)(2k-5r)[/tex]

Step-by-step explanation:

We have to find the equation which are true identity.

a.[tex](3-2y)(2y-3x)[/tex]

[tex](3x-2y)(2y-3x)=3x(2y-3x)-2y(2y-3x)[/tex]

[tex]=6xy-9x^2-4y^2+6xy[/tex]

[tex](3-2y)(2y-3x)\neq 9x^2-4y^2[/tex]

b.[tex](2k+5r)(2k-5r)[/tex]

[tex](2k)^2-(5r)^2[/tex]

Using identity

[tex](a+b)(a-b)=a^2-b^2[/tex]

[tex]4k^2-25r^2[/tex]

It is true.

Hence, option b is true.

Answer Link
GivAnswers
GivAnswers GivAnswers
  • 15-08-2021

Answer:

option b

Step-by-step explanation:

Answer Link

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