Question

please answer the 2 question

Answer 1

you can use the sutaible identity
$(a + b) 3$
$(a + b + c)2$

Answer 2

1)(3a+5b+5c)2
Using identity (a+b+c)2=a2+b2+c2+2ab+2bc+2ca
9a2+25b2+25c2+15ab+25bc+15ca
2)(-2x+3y+2z)2
same identity will be used
4x2+9y2+4z2-6xy+6yz-4zx