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((x-1)(x+1)(x+4)(x+6))/(7x^2+8x+4)>0...

`((x-1)(x+1)(x+4)(x+6))/(7x^2+8x+4)>0`

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1/((x-2)(x-4))+1/((x-4)(x-6))+1/((x-6)(x-8))+1/3=0

(iv) ((2x+1)/(x+1))^(4)-6((2x+1)/(x+1))^(2)+8=0

The expression (1)/(x-1)-(1)/(x+1)-(2)/(x^(2)+1)-(4)/(x^(4)+1) is equal to (8)/(x^(8)+1)( b) (8)/(x^(8)-1)( c) (8)/(x^(7)-1) (d) (8)/(x^(7)+1)

(x^(2)+(1)/(x^(2))+2)+(x^(4)+(1)/(x^(4))+5)+(x^(6)+(1)/(x^(6))+8)+

(x+4)^(6)(x+3)^(6)(x+2)^(7)(x-1)^(8)<=0

Check whether the following are quadratic equations : (1) (x-3)^(2)=x(2x-5) (2) (2x-3)(8x+1) = (4x+5)(4x-5) (3) (5x+3)(x-2)=(4x+3)(2x-1) (4) (2x+5)^(3)=8(x-1)^(3) (5) x^(2)+7x-8=x(x+5) (6) x^(3)+9x^(2)-7x+2=(x+3)^(3)