Question

Please answer

It is herbal request to you genius(gan)

Answer 1

Answer:

(3x^2 +7x^2 +21xy)-(3x^2 - 21xy+7x^2)

3x^2+7x ^2 +21xy - 3x^2+21xy - 7x^2

42xy

Answer 2

Answer:

84xy

Step-by-step explanation:

hey

see it's really simple just use a2 - b2 identity

${a}^{2} - {b}^{2} = (a + b)(a - b)$

after simplifying we get

$(3x \times 7y) \times 4$