Does 15,20,25 represent a pythagorean triple?

This is a Pythagorean triple.

Step-by-step explanation:

In order to find this, use the Pythagorean Theorem to and see if it gives a true statement.

a^2 + b^2 = c^2

15^2 + 20^2 = 25^2

225 + 400 = 625

625 = 625

Since this is a true statement, we know that this is a Pythagorean Triple.

12

step-by-step explanation:

hello from mrbilldoesmath!

answer:   (7x + 6y) ( 49x^2 - 42xy + 36y^2)

discussion:

in general, the factorization of a^3 + b^3 is

a^3 + b^ 3 = (a + b) ( a^2 - ab + b^2)

in our case note that 343 = 7^3 and 216 = 6^3 so the equation becomes:

343x^3 + 216y^3 = (7x)^3 + (6y)^3

if you think of a (above) as 7x and b as 6y the factorization becomes

343x^3 + 216y^3 =

((7x + 6y) (   (7x)^2 - 7x*6y + (6y)^2)   =

(7x + 6y) ( 49x^2 - 42xy + 36y^2)

you,

mrb

(a + b) (a^2 - a b + b^2)