Question

if x=m^3 and y=2n^2, write the following in terms of m and r. 3x^2y

Answer 1

I think you meant to say "in terms of m and n" (not m and r)

Answer 2

am I correct with that assumption?

Answer 3

the paper says m and r but I thinks its m and n

Answer 4

yeah I think it's m and n too because r is nowhere to be found

Answer 5

x=m^3


x^2=(m^3)^2 ... square both sides


x^2=m^(3*2)


x^2=m^6

Answer 6

3x^2y

3m^6y ... replace x^2 with m^6 (since x^2 = m^6, found earlier)

3m^6*2n^2 ...replace y with 2n^2 (because it's given that y = 2n^2)

3*2m^6n^2

6m^6n^2


so this means that 3x^2y = 6m^6n^2 when x = m^3 and y = 2n^2

Answer 7

ohh it makes much more sense, thank you so much!

Answer 8

you're welcome