if 2x² – 7x + 5 =0, then what is the value of $$x^2+{25\over 4x^2}$$

if $$x-{1\over 5},x≠0,$$ then what is the value of $${x^6+3x^3-1}\over x^6-8x^3-1$$=?

 if $$\sqrt { 11- 3\sqrt { 8}}=a+b\sqrt { 2}$$, then what is the value of (2a+3b)?

If (x + y)³ +8 (x - y)³ = (3x+ Ay)(3x²+ Bxy+ Cy²), then the value of A+B+C is:

If 9x² + y² = 37 and xy = 2, x, y>0, then the value of (27x³+ y³) is:

If (10 a³+4b³):(11a³-15b³)=7:5, then (3a+5b):(9a-2b)=?

The expression   $${15(\sqrt { 10}+\sqrt { 5})\over \sqrt { 10}+\sqrt { 20}+\sqrt { 40}-\sqrt { 5}-\sqrt { 80}     }$$ is equal to:

 If 3x²-5x+1=0, then the value of ( $$x^2+{1\over 9x^2}$$) is