Vietnamese | Math Olympiad | How to Solve a Nice Square Root Problem | Find X=?

[@Shama-l2w]

Mind blowing, fantastic and super

[@walterwen2975]

Vietnamese Math Olympiad: √(x² - 81) = 10√(x - 9), x = ? √(x² - 81) - 10√(x - 9) = √[(x - 9)(x + 9)] - 10√(x - 9) = 0 [√(x - 9)][√(x + 9) - 10] = 0, x - 9 = 0 or √(x + 9) - 10 = 0 x = 9 or √(x + 9) = 10, x + 9 = 10²= 100; x = 91 Answer check: x = 9: √(x² - 81) = √(9² - 81) = 0, 10√(x - 9) = 10√(9 - 9) = 0; Confirmed x = 91: √(91² - 81) = √[(91 - 9)(91 + 9)] = 10√82 = 10√(x - 9); Confirmed Final answer: x = 9 or x = 91

[@ilmpedia9835]

Yes, correct, thanks for your feedback

[@raman-r6i]

Great teaching method

[@ilmpedia9835]

Glad you liked it

[@sony-n7k8h]

Excellent, outstanding

[@ilmpedia9835]

Thank you so much 😀

[@shahnazkhatun71]

Excellent

[@ilmpedia9835]

Thank you so much 😀

[@Bindas-k6l]

Mind blowing sir

[@ilmpedia9835]

Thanks a lot

[@sony-n7k8h]

Thank u 🙏 sir

[@ilmpedia9835]

Most welcome

[@himo3485]

x² - 81 = 100(x - 9) x² - 81 = 100x - 900 x² - 100x + 819 = 0 (x - 9)(x - 91) = 0 x = 9 , 91

[@ilmpedia9835]

Yes, you are Correct ,we can

[@ilmpedia9835]

Thank you for your feedback