Find the cube of 19 without actual multiplication.
please write the answer with steps.
this is a request.
I will mark the best answer brainiest
unnecessary answer is not encouraged. I will surely report invalid answers
Answers
Answered by
1
Answer:
(a+b)³ = a³+3a²b+3ab²+b³
so,
19³
= (10+9)³
= 10³+3×10²×9+3×10×9²+9³
= 1000+3×100×9+3×10×81+729
= 1000+2700+2430+729
= 6859
Answered by
0
Answer:
6859
Step-by-step explanation:
(a+b)³ = a³+3a²b+3ab²+b³
so,
19³
= (10+9)³
= 10³+3×10²×9+3×10×9²+9³
= 1000+3×100×9+3×10×81+729
= 1000+2700+2430+729
= 6859
Plzzz Brailiest
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