Question

Q.13 If (3x-y)==9x2+B xy +y2 , what is the value of B ?​

Answer 1

Answer:

$B=-6$

Step-by-step explanation:

$(3x-y)^{2} =9x^{2} +Bxy+y^{2}\\= 9x^{2} + [(-2)3]xy+y^2\\= 9x^{2} +(-6)xy+y^2\\=9x^2 -6xy+y^2=9x^2+Bxy+y^2$

Comparing both sides,

$B=-6$