Question

if (a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca the value of (7x+3y+z^2)=​

Answer 1

Answer:

Step-by-step explanation:

(7x+3y+$z^{2}$)=$(7x)^{2} +(3y)^{2} +(z^{2}) ^{2} +2.7x.3y +2.3y.z^{2} +2.7x.z^{2} \\=49x^{2} +9y^{2} +z^{4} +42xy+6yz^{2} +14xz^{2}$