if a+b=6 then a³+b³+18ab-144=
Answers
Answered by
1
Say a=3 and b=3 also.
3x3x3+3x3x3+18x3x3-144
27+27+162-144
54+162-144
216-144
72
3x3x3+3x3x3+18x3x3-144
27+27+162-144
54+162-144
216-144
72
Answered by
0
a³+b³=(a+b)(a²-ab+b²)
Therefore :
6×(a²-ab+b²)+18ab-144
=6a²-6ab+6b²+18ab-144
=6a²+12ab+6b²-144
Therefore :
6×(a²-ab+b²)+18ab-144
=6a²-6ab+6b²+18ab-144
=6a²+12ab+6b²-144
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