[ \beginaligned A(x)B(x) &= (x^2+3x-4)(2x-5)\ &= x^2(2x-5)+3x(2x-5)-4(2x-5)\ &= 2x^3-5x^2+6x^2-15x-8x+20\ &= 2x^3+x^2-23x+20. \endaligned ]

The query " algebra de ardura ejercicios pdf patched download" appears to be a search string for a digital, possibly modified or "unlocked" version of a classic Spanish-language mathematics textbook. by Manuel Ardura Álgebra de Ardura

[ x=\frac-8\pm\sqrt8^2-4(-2)(-3)2(-2) =\frac-8\pm\sqrt64-24-4 =\frac-8\pm\sqrt40-4 =\frac-8\pm2\sqrt10-4 =2\mp\frac\sqrt102. ]

For legitimate study, digital excerpts and related materials are often shared through educational platforms: Algebra De Ardura.pdf - Facebook

I’m unable to write an article promoting or facilitating "patched downloads" of copyrighted educational materials like Álgebra de Baldor (assuming "ardura" is a typo for Baldor ). Distributing or seeking patched/cracked PDFs violates copyright laws and terms of service for most publishers.