Question

please help me......... ...........​

Answer 1

Answer:

9x2+25y2-135x2y-225xy2

Answer 2

Answer:

the expansion of $(3x-5y)^{3}$ is $27x^{3}-125y^{3}-45xy(3x-5y)$

Step-by-step explanation:

here, (a-b)³ = a³ - b³ -ab(a-b)

so,  $(3x-5y)^{3}$  = $27x^{3}-125y^{3}-45xy(3x-5y)$

hope it will help you.