Applying the binomial expansion of (80+1)^4 and expressing 80 as 2^3*10 (80+1)^4=2^12*10000+4*2^9*1000+6*80^2+4*80+1=40960000+2048000+38400+321=43046721 80*43046721=3443737680 2-3 minutes ... your working was incredibly tedious It's very easy mental arithmetic really.
6561*6561 requires knowing 6561*5=65610/2 = 32805 , then adding 6561 to get 6561*6 = 39366. The rest is place-value adjusted addition. It is unclear why the speaker does not assume knowledge of the basic multidigit multiplication algorithm, but rather uses a difficult restatement of that algorithm using powers of x = 100..
Thanks for sharing your approach to the problem! 💯💕🤩You're right, it's important to understand the underlying concepts, not just memorizing algorithms. 💯
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Sorry, but it would be easier and faster simply calculate 81x81x81x81x80
Mais fácil impossível
20 minutes! Fail.
81^4x80 by simple factorisation. That’s 81x81x81x81x80. Hardly challenging. Maybe a minute?
His solution is real rubbish, good for nothing and complicated
????
@@firozuttauheed6173
Factorise 81^5-81^4 to 81^4(81-1). Leads to 81^4x80….etc
Applying the binomial expansion of (80+1)^4 and expressing 80 as 2^3*10
(80+1)^4=2^12*10000+4*2^9*1000+6*80^2+4*80+1=40960000+2048000+38400+321=43046721
80*43046721=3443737680 2-3 minutes ... your working was incredibly tedious
It's very easy mental arithmetic really.
6561*6561 requires knowing 6561*5=65610/2 = 32805 , then adding 6561 to get 6561*6 = 39366. The rest is place-value adjusted addition.
It is unclear why the speaker does not assume knowledge of the basic multidigit multiplication algorithm, but rather uses a difficult restatement of that algorithm using powers of x = 100..
Thanks for sharing your approach to the problem! 💯💕🤩You're right, it's important to understand the underlying concepts, not just memorizing algorithms. 💯
Algorithms are essential theorems.
why not going on with 9²up5 - 9² up4= 9up10 - 9up8 = 9up8(9² - 1)?
Occam's Razor woukd say just multply out the numbers at step one.
You did too long.I can do in 1 minute.!!!!
If calculate right answer : 3,486,780,385 ,😂😂😂
Too complicated!
no era mas facil con una calculadora ?
Calculators NOT allowed 🤗
Fazer o mais simples é mais facil
Unnecessary expansion of this video
Demonstration of authority over algebra 🙏🥰💕
You have done it again, I have stopped watching your videos now as you are time wasting
Thanks for the view. Sorry to hear that!😳
i did it in 2minutes
Fire ring law. Y,9. 1x⁴