Question

Find the value of. (1) (-8) cube+(-12) cube+(20) cube.​
(2) (-x) cube+(-2x) cube+(3x) cube.

Answer 1

$1) \: \:( { - 8}) {}^{3} + ( - 12) {}^{3} + {20}^{3}$

$= \: - 512 + 1728 + 8000$

$= \: - 512 + 9728$

$= \: 9216$

Now 2nd solution

$2) \: \: ( - x) {}^{3} + ( - 2x) {}^{3} + (3x) {}^{3}$

$= \: \: - x - 8x {}^{3} + 27 x{}^{3}$

$= \: \: - x - 19x {}^{3}$

Step-by-step explanation:

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