Question

please answer this question and plz explain how did u do it​

Answer 1

Answer:

SEE,

THERE IS AN IDENTITY (x+y+z)²=x²+y²+z²+2xy+2yz+2zx

we will apply that identity

we know that square of any negative number will be positive so it is of no use.

but in the q the negative terms are -2ab and -2bc

both have b common that means b is negative.

so the correct ans is option (c)

Step-by-step explanation: