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(ab⁴-ba⁴)/(a³-b³)+3ab

a=√11-2

b=√11+2

(√11-2)(√11+2)⁴-(√11+2)(√11-2)⁴/(√11-2)³-(√11+2)³=-((√11)²-2²)=-(11-4)=-7

 

 

 

5^2x+3<=0.2

5^2x+3<=5^-1

2x+3<=1

2x<=1-3

2x<=-2

x<=-1

(-∝; -1]

3) 4^4x-2<0.25

4^4x-2<4^-1

4x-2<-1

4x<2-1

x<1/4

(-∝;1/4)