Question

(3x-y)(3x+y)

try find the answer ​

Answer 1

Answer:

$9x^{2} -y^{2}$

Step-by-step explanation:

$(3x-y)(3x+y)$

$=3x^{2} -y^{2}$(∴(a-b)(a+b)=a²-b²)

$=9x^{2} -y^{2}$

$Or$

$(3x-y)(3x+y)$

$=3x(3x+y)-y(3x+y)$

$=9x^{2} +3xy-3xy-y^{2}$

$=9x^{2} -y^{2}$