book Maths Puzzle Numerical Ability

Find a polynomial of degree 4 with intger coefifients that has 2 square root + 5 square root as a root.

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book Other Question

how do you solve the equation 3x = 3(3x + 1). I am having a hard time with Algebraic Fractions. My question is Reduce the fraction 6x/12x to lowest terms? Is the answer 1/2x??? Please let me know.