exam Maths Puzzle Numerical Ability

x4 – 3 x2 + 2 = 0.
Explain how one can use the quadratic formula to solve this equation by using a change of variable. Solve this equation completely.

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exam Other Question

Please simplify and multiply the square root. Thanks!

(√18+√8)(√18-√8)
Given a polynomial p(x), a square matrix M whose characteristic polynomial is p(λ)is called a companion matrix of p(x).
Evaluate the polynomial {{{p(x) = x^3 + bx^2 + cx + d}