Example Problems VIII — task. Mathematics CBSE, Class 9.

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Write the following cubes in expanded form:

(i)

$(2x + 1)^3=$

(ii)

$(2a − 3b)^3=$

Answer variants:

$8a^3 – 27b^3 – 36a^2b - 54ab^2$

$8x^3 + 12x^2 + 6x + 1$

$8x^3 -12x^2 + 6x -1$

$8a^3 + 27b^3 –36a^2b + 54ab^2$

$8a^3 – 27b^3 – 36a^2b + 54ab^2$

$8x^3 - 12x^2 + 6x + 1$

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