Question

hello! please answer the second question​

Answer 1

For any 3 numbers, a, b, c

$if \: a + b + c = 0 \: then \\ {a}^{3} + b {}^{3} + {c}^{3} = 3abc$

since,

a+b+c= 30+20-50=50-50=0

${30}^{3} + {20}^{3} - {50}^{3} \\ = 30 \times 20 \times - 50 \\ = - 30000$

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