Question

(3x+5y+2z) (3x-5y-2z) Expand

Answer 1

Answer:

(3x+5y+2z){3x-5y-2z}

={3x+(5y+2z)}{3x-(5y+2z)}

=(3x)^2-(5y+2z)^2

=9x^2-(25y^2+4z^2+2×5y×2z)

=9x^2-25y^2-4z^2-20z

Step-by-step explanation:

formula applied

1* a^2-b^2=(a+b)(a-b)

2* (a+b)^2=a^2+b^2+2ab

Answer 2

Answer:

Step-by-step explanation:

=9x²-15xy+6xz+15xy-25y²+10yz+6xz-10zy+4z²

=9x²-25y²+4z²-15xy+15xy+6xz+6xz+10yz-10yz

=9x²-25y²+4z²+12xz