Question

if a + b = -1 then a ^3 +b ^3 -3ab is ?
do not try to write anything for freee points,write answer only if u know ,who will answwer correctly will be marked as brainliest

Answer 1

Using Rule 21,

a^3 + b^3 + c^3 – 3abc = 0

3 – 3abc = 0

If a + b + c = 0 , a^3 - b^3 - c^3 – 3abc = 0

3 – 3abc = 0⇒ a - b - c = 0

3 – 3abc = 0⇒ a - b - c = 0⇒ a = b + c

hope it help

Answer 2

Answer:

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