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2] Let x,yER Prove that VxVy(10x+21y>21⇒(x>11/10 v y>10/21))

2] Let x,yER Prove that VxVy(10x+21y>21⇒(x>11/10 v y>10/21))

Advanced Engineering Mathematics
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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1] Let x,yER. Prove that VxVy(4x+9y>9⇒(x>5/4 Vy> 4/9)) using method of indirect proof. (x>11/10 v y>10/21)) 2] Let X,YER Prove that VxVy(10x+21y>21 4] Let x, YER Using proof by contradiction, prove that VxVy(512y3+8x²y<x³+64y²x+8y≤x)
Transcribed Image Text:1] Let x,yER. Prove that VxVy(4x+9y>9⇒(x>5/4 Vy> 4/9)) using method of indirect proof. (x>11/10 v y>10/21)) 2] Let X,YER Prove that VxVy(10x+21y>21 4] Let x, YER Using proof by contradiction, prove that VxVy(512y3+8x²y<x³+64y²x+8y≤x)
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