Evaluate the following using suitable identity : (-2a, -3b) ^3
BhawnaAggarwalBT:
hey is there is comma between -2a and -3b ???
No
is the question is (-2a - 3b )^3 ?????
Yes
ok
Plz sove
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Answered by
7
Hey Here is your answer
(- 2a - 3b )³
by using identity
(a-b)³ = a³ - b³ - 3ab(a-b)
(- 2a - 3b )³
= (- 2a)³ - (3b)³ - 3×(-2a)×(-3b) [-2a - 3b]
-8a³ - 81b³ - 18ab [-2a - 3b]
-8a³ - 81b³ + 36a²b + 54ab²
hope this helps you
### BE BRAINLY ###
(- 2a - 3b )³
by using identity
(a-b)³ = a³ - b³ - 3ab(a-b)
(- 2a - 3b )³
= (- 2a)³ - (3b)³ - 3×(-2a)×(-3b) [-2a - 3b]
-8a³ - 81b³ - 18ab [-2a - 3b]
-8a³ - 81b³ + 36a²b + 54ab²
hope this helps you
### BE BRAINLY ###
Answered by
0
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