Question

expand the following
a) (2x+y) cube​

Answer 1

Answer:

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

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

$8 {x}^{3} + {y}^{3} + 6x {y}^{2} + 6 {x}^{2} y$

Answer 2

Answer:

(2x+y)^3

=By using identity (a+b)^3=a^3+3a^2b+3ab^2+b^3

=(2x)^3+3(2x)^2(y)+3(2x)(y)^2+y^2

=8x^3+12x^2y+6xy^2+y^3

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