Answer 1

In the given problem, we have to find Product of equations

 Given (3x − 4y + 5z) (9x² +16y² + 25z² + 12xy −15zx + 20yz)

We shall use the identity 

`x^3 + y^3 + z^3 -xyz = (x+ y +z)(x^2 + y^2+z^2 - xy - yz -zx)`

` = (3x)^3 + (-4y)^3 + (5z)^3 - 3 (3x)(4y) (5z)`

`=  (3x)xx (3x)xx(3x) - (-4y) xx (-4y) xx (-4y)+(5z)xx (5z)xx(5z) -3 (3x) (-4y)(5z)`

` = 27x^3 - 64y^3 + 125z^3 + 180xyz`

Hence the product of (3x − 4y + 5z) (9x² +16y² + 25z² + 12xy −15zx + 20yz)is ` 27x^3 - 64y^3 + 125z^3 + 180xyz`