Question

expand (x+3y-5z)^2 by using suitable identity​

Answer 1

Step-by-step explanation:

(2x+3y+5z)2

 Using, (a+b+c)2=a2+b2+c2+2ab+2bc+2ac

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

=4x2+9y2+25z2+12xy+30yz+20zx.