exam Maths Puzzle Numerical Ability

^3(square root) of 16y^3

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exam Other Question

the degree three polynomial f(x) with real coefficients and leading coefficient 1, has -3 and +4i among its roots. Express f(x) as the productof of linear and quadriatic polynomials with real coefficients Tutor could you help me ?

How do I solve
10x^2-16x+6=0

thank you