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

If $$x+{1\over x}=c{1\over c}$$ then the value of x

$$4a-{4\over a}+3=0$$ then the value of :   $$ a^3-{1\over a^3}+3=?$$

If 27(x+y)³ – 8(x-y)³=(x+5y)(Ax²+By²+Cxy), then what is the value of (A+B-C)?

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

If p, q, r are all real numbers, then (p – q)³ + (q – r)³ + (r – p)³ is equal to 

$$x+{1\over x}=2$$ and x is real, then the value of $$x^{17}+{1\over x^{19}}$$ is

When a number x is divided by a divisor it is seen that the divisor = 4 times the quotient=double the remainder. If the remainder is 80 then the value of x is