Question

Expand ( − 3)ଶ

using identities.​

Answer 1

Answer:

Solution:

(−2x+5y−3z) 2

is of the form(a+b+c)2a+b+c)2=a2+b2+c2+2ab+2bc+2ca

where a=−2x,b=5y,c=−3z

∴(−2x+5y−3z) 2

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

=4x 2 +25y 2+9z 2−20xy−30yz+12zx.