exam Maths Puzzle Numerical Ability

Is this correct?

18x^5+15x^4-75x^3z^2

Answer? 3x^3(6x+5z)(x-5z)

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exam Other Question

determine the perpindicular distance between
a. the parellel planes: x+2y+3z+6=0 and x+2y+3z-6=0 The degree three polynomial f(x) with real coefficients and leading coefficient 1, has -3 and +4i among its roots. Express f(x) as a product of linear and quadratic polynomials with real coefficients.