Question

Expand:
1.(3x+5y+2z)(3x-5y+2z)
2.(3x-5y-2z)(3x-5y+2z)

Answer 1

Answer:

Step-by-step explanation

1. Multiply all terms of 1 st brackets with 2nd bracket

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

6x-15xy+6xz+15xy-25y2+10yz+6xz-10yz+4z2

6x+6xz+6xz-25y2+4z2

6x+12xz-25y2+4z2