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. 💯
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.
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
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.
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.
why not going on with 9²up5 - 9² up4= 9up10 - 9up8 = 9up8(9² - 1)?
You did too long.I can do in 1 minute.!!!!
If calculate right answer : 3,486,780,385 ,😂😂😂
Occam's Razor woukd say just multply out the numbers at step one.
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 🙏🥰💕
i did it in 2minutes
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!😳
Fire ring law. Y,9. 1x⁴