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netineya [11]
3 years ago
13

9th one pls fast as soon as possible

Mathematics
2 answers:
erica [24]3 years ago
4 0
The answer is -1... which is option a. I had a to be -0.69 and b to be -0.31.. l hope it helped??
ladessa [460]3 years ago
4 0

Answer

Value of a3³+b³-3ab = -1

Explanation

Given a+b=-1----(1)

On cubeing both sides of equation (1), we get

(a+b)³ = (-1)³

Call 98%

we know the algebraic identity:

(x+y)³ = x³+y³ + 3xy(x+y)

=> a³ + b³ +3ab(a+b)= -1

=> a³ + b³ +3ab(-1)=-1

/* from (1)*/

=> a³ + b³-3ab = -1

Therefore,

Value of a³+b³-3ab = -1

Please give me brainliest (click on the crown) Thank you :)

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