Question

help!
answer the sixth question​

Answer 1

Step-by-step explanation:

Given a³ + b³ + 6ab - 8

a³ + b³ + 3ab(a+b) - 8

(a+b)³ - 8

(2)³ - 8

8 - 8

= 0

Answer 2

Answer:

0

Step-by-step explanation:

a+b=2

cubing both sides

${(a + b)}^{3} = {2}^{3} \\ {a}^{3} + {b}^{3} + 3ab(a + b) = 8 \\ {a}^{3} + {b}^{3} + 3ab(2) = 8 \\ {a}^{3} + {b}^{3} + 6ab = 8 \\ {a}^{3} + {b}^{3} + 6ab - 8 = 0$

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