Question

evaluate (3x-y)^2 by using suitable identity​

Answer 1

Step-by-step explanation:

$(a-b)²= a²+b²-2ab \\ </p><p>(3x)²+(y)²-2(3x)(y) \\ </p><p>9x²+y²-6xy</p><p>$

Answer 2

$\huge{ \sf{ \underbrace{ \underline{question}}}}$

$(3x - y) {}^{2}$

$\huge{ \sf{ \underbrace{ \underline{answer}}}}$

$(3x - y) {}^{2} \\ \implies(3x - y)(3x - y) \\ \implies3x(3x - y) - y(3x - y) \\ \implies9x {}^{2} - 3xy - y(3x - y) \\ \implies9x {}^{2} - 6xy + y {}^{2}$

$\huge \green{ \sf{ \underline{hence \: verified}}}$

$9x {}^{2} - 6xy + y {}^{2}$