Method for finding HCF of the given polynomials :
    Step 1 : Express each polynomial as a product of powers of irreducible factors which also requires the numerical factors to be expressed as the product of the powers of primes.
    Step 2 : If there is no common factor then HCF is 1 and if there are common irreducible factors, we find the least exponent of these irreducible factors in the factorized form of the given polynomials.
    Step 3 : Raise the common irreducible factors to the smallest or the least exponents found in step 2 and take their product to get the HCF.