exam Maths Puzzle Numerical Ability

Given h(x)=-3(3-x)/x, solve for h(x+a)-h(x).

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Can you help me to solve these
1. Find all zeros, both real and complex, of f(x)=x3-8x2 + 25x - 26 (3 and 2 are exponent) and write the polynomial in factored form.
simplify
(4x3power y4power)(3x2nd power y)