exam Maths Puzzle Numerical Ability

find a polynomial with leading coefficent 1 and degree 3 that has -1,11, and 3 as roots

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exam Other Question

prove that k(25k-8)>0

Hence find the set of values of k

Write down the values of k for which the equation x^2 +5kx + 2k = 0 has equal roots
Factor Completely. y^4 + 3y^3 -5y^2 -15y

I am struggling with this problem and need some assistance with this. Thanks