Question

plz help me i want solutions of question 1 ,3 and 4​

Answer 1

identity is:-

(a+b+c)2 = a2+b2+c2+2ab+2bc+2ca

(1):. X2+4y2+16z2+4xy+16yz+8xz

(2):. 4x2+9y2+4z2-12xy+12yz-8xz

(3):. 9a2+49b2+c2-42ab+14bc-6ac

Answer 2

1.(x+12y+4z)^2

(a+b+c)^2=a^2+b^2+c^2+2ab+2bc2ca

= x^2+(12y)^2+(4z)^2+2×x×12y

+2×12y×4z+2×4z×x =x^2+144y^2+16z^2+48xy+92yz+32xz

expand 3 and 5 by also the same method