Question

Find the expansion of : (5x + 3y)3 ​

Answer 1

Answer:

By using idenity (x-y)^3

(5x)^3 - (3y)^3 - 3(5x)(3y)(5x-3y)

125x^3 - 27y^3 - 45xy(5x-3y)

125x^3 - 27y^3 - 225x^2y + 135xy^2

hope it's help u....

Answer 2

Answer:

hey mate here's your answer

applying identity

(a+b)³=a³+b³+3a²b+3ab²

a= 5x ; b= 3y

= (5x)³+(3y)³+3(5x)²(3y)+3(5x)(3y)²

=125x³+27y³+225x²y+135xy²

if you want

3(5x+3y)

then,

3×5x+3×3y

=15x+9y

hope it will help you....✌